156000021540 has 48 divisors (see below), whose sum is σ = 476509158720. Its totient is φ = 37818186880.

The previous prime is 156000021533. The next prime is 156000021547. The reversal of 156000021540 is 45120000651.

It is an interprime number because it is at equal distance from previous prime (156000021533) and next prime (156000021547).

It is a self number, because there is not a number n which added to its sum of digits gives 156000021540.

It is not an unprimeable number, because it can be changed into a prime (156000021547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118181175 + ... + 118182494.

It is an arithmetic number, because the mean of its divisors is an integer number (9927274140).

Almost surely, 2^156000021540 is an apocalyptic number.

156000021540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156000021540 is an abundant number, since it is smaller than the sum of its proper divisors (320509137180).

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

156000021540 is a wasteful number, since it uses less digits than its factorization.

156000021540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236363692 (or 236363690 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 156000021540 in words is "one hundred fifty-six billion, twenty-one thousand, five hundred forty".