165387878792 has 8 divisors (see below), whose sum is σ = 310102272750. Its totient is φ = 82693939392.

The previous prime is 165387878791. The next prime is 165387878837. The reversal of 165387878792 is 297878783561.

It can be written as a sum of positive squares in only one way, i.e., 139342437796 + 26045440996 = 373286^2 + 161386^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (165387878791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336742417 + ... + 10336742432.

Almost surely, 2^165387878792 is an apocalyptic number.

It is an amenable number.

165387878792 is a deficient number, since it is larger than the sum of its proper divisors (144714393958).

165387878792 is a wasteful number, since it uses less digits than its factorization.

165387878792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20673484855 (or 20673484851 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 71.

The spelling of 165387878792 in words is "one hundred sixty-five billion, three hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred ninety-two".