156643435020 has 24 divisors (see below), whose sum is σ = 438601618224. Its totient is φ = 41771582656.

The previous prime is 156643435009. The next prime is 156643435027. The reversal of 156643435020 is 20534346651.

It is a self number, because there is not a number n which added to its sum of digits gives 156643435020.

It is not an unprimeable number, because it can be changed into a prime (156643435027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305361899 + ... + 1305362018.

It is an arithmetic number, because the mean of its divisors is an integer number (18275067426).

Almost surely, 2^156643435020 is an apocalyptic number.

156643435020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156643435020 is an abundant number, since it is smaller than the sum of its proper divisors (281958183204).

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

156643435020 is a wasteful number, since it uses less digits than its factorization.

156643435020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610723929 (or 2610723927 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The spelling of 156643435020 in words is "one hundred fifty-six billion, six hundred forty-three million, four hundred thirty-five thousand, twenty".