156621605720 has 16 divisors (see below), whose sum is σ = 352398612960. Its totient is φ = 62648642272.

The previous prime is 156621605719. The next prime is 156621605729. The reversal of 156621605720 is 27506126651.

It is a super-2 number, since 2×156621605720² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156621605729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1957770032 + ... + 1957770111.

It is an arithmetic number, because the mean of its divisors is an integer number (22024913310).

Almost surely, 2^156621605720 is an apocalyptic number.

156621605720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156621605720 is an abundant number, since it is smaller than the sum of its proper divisors (195777007240).

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

156621605720 is a wasteful number, since it uses less digits than its factorization.

156621605720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915540154 (or 3915540150 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 156621605720 in words is "one hundred fifty-six billion, six hundred twenty-one million, six hundred five thousand, seven hundred twenty".