161565615000 has 120 divisors (see below), whose sum is σ = 546792048660. Its totient is φ = 43084152000.

The previous prime is 161565614989. The next prime is 161565615007. The reversal of 161565615000 is 516565161.

161565615000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×161565615000² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161565615007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1750174 + ... + 1840173.

Almost surely, 2^161565615000 is an apocalyptic number.

161565615000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161565615000 is an abundant number, since it is smaller than the sum of its proper divisors (385226433660).

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

161565615000 is a wasteful number, since it uses less digits than its factorization.

161565615000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590379 (or 3590357 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 161565615000 in words is "one hundred sixty-one billion, five hundred sixty-five million, six hundred fifteen thousand".