165515781236456 has 32 divisors (see below), whose sum is σ = 354704782152000. Its totient is φ = 70929713200896.

The previous prime is 165515781236389. The next prime is 165515781236471. The reversal of 165515781236456 is 654632187515561.

It is a junction number, because it is equal to n+sod(n) for n = 165515781236392 and 165515781236401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116404001 + ... + 117817328.

It is an arithmetic number, because the mean of its divisors is an integer number (11084524442250).

Almost surely, 2^{165515781236456} is an apocalyptic number.

It is an amenable number.

165515781236456 is an abundant number, since it is smaller than the sum of its proper divisors (189189000915544).

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

165515781236456 is a wasteful number, since it uses less digits than its factorization.

165515781236456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234233961 (or 234233957 counting only the distinct ones).

The product of its digits is 181440000, while the sum is 65.

The spelling of 165515781236456 in words is "one hundred sixty-five trillion, five hundred fifteen billion, seven hundred eighty-one million, two hundred thirty-six thousand, four hundred fifty-six".