156765721660 has 48 divisors (see below), whose sum is σ = 340766899200. Its totient is φ = 60507224064.

The previous prime is 156765721649. The next prime is 156765721691. The reversal of 156765721660 is 66127567651.

It is a junction number, because it is equal to n+sod(n) for n = 156765721598 and 156765721607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 883276 + ... + 1045804.

It is an arithmetic number, because the mean of its divisors is an integer number (7099310400).

Almost surely, 2^156765721660 is an apocalyptic number.

156765721660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156765721660 is an abundant number, since it is smaller than the sum of its proper divisors (184001177540).

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

156765721660 is a wasteful number, since it uses less digits than its factorization.

156765721660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164230 (or 164228 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 52.

The spelling of 156765721660 in words is "one hundred fifty-six billion, seven hundred sixty-five million, seven hundred twenty-one thousand, six hundred sixty".