1557020000 has 120 divisors (see below), whose sum is σ = 3866962176. Its totient is φ = 616896000.

The previous prime is 1557019969. The next prime is 1557020033. The reversal of 1557020000 is 207551.

It is a super-2 number, since 2×1557020000² = 4848622560800000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2539694 + ... + 2540306.

Almost surely, 2^1557020000 is an apocalyptic number.

1557020000 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 1557020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1933481088).

1557020000 is an abundant number, since it is smaller than the sum of its proper divisors (2309942176).

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

1557020000 is an equidigital number, since it uses as much as digits as its factorization.

1557020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 1557020000 is about 39459.0927417243. The cubic root of 1557020000 is about 1159.0390376750.

Adding to 1557020000 its reverse (207551), we get a palindrome (1557227551).

The spelling of 1557020000 in words is "one billion, five hundred fifty-seven million, twenty thousand".