1660157020 has 48 divisors (see below), whose sum is σ = 3659862528. Its totient is φ = 631357760.

The previous prime is 1660157011. The next prime is 1660157027. The reversal of 1660157020 is 207510661.

It is a super-2 number, since 2×1660157020² = 5512242662110560800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1660157020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660157027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66015 + ... + 87625.

It is an arithmetic number, because the mean of its divisors is an integer number (76247136).

Almost surely, 2^1660157020 is an apocalyptic number.

1660157020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660157020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1829931264).

1660157020 is an abundant number, since it is smaller than the sum of its proper divisors (1999705508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660157020 is a wasteful number, since it uses less digits than its factorization.

1660157020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21810 (or 21808 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1660157020 is about 40745.0244815241. The cubic root of 1660157020 is about 1184.0854795466.

Adding to 1660157020 its reverse (207510661), we get a palindrome (1867667681).

The spelling of 1660157020 in words is "one billion, six hundred sixty million, one hundred fifty-seven thousand, twenty".