1666957020 has 96 divisors (see below), whose sum is σ = 4928851200. Its totient is φ = 419779584.

The previous prime is 1666957009. The next prime is 1666957027. The reversal of 1666957020 is 207596661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666957027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 382011 + ... + 386349.

It is an arithmetic number, because the mean of its divisors is an integer number (51342200).

Almost surely, 2^1666957020 is an apocalyptic number.

1666957020 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 1666957020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2464425600).

1666957020 is an abundant number, since it is smaller than the sum of its proper divisors (3261894180).

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

1666957020 is a wasteful number, since it uses less digits than its factorization.

1666957020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4707 (or 4705 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 1666957020 is about 40828.3849790804. The cubic root of 1666957020 is about 1185.6999478874.

The spelling of 1666957020 in words is "one billion, six hundred sixty-six million, nine hundred fifty-seven thousand, twenty".