78990135165 has 96 divisors (see below), whose sum is σ = 146684079360. Its totient is φ = 39205555200.

The previous prime is 78990135157. The next prime is 78990135167. The reversal of 78990135165 is 56153109987.

It is not a de Polignac number, because 78990135165 - 2³ = 78990135157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78990135167) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17784345 + ... + 17788785.

It is an arithmetic number, because the mean of its divisors is an integer number (1527959160).

Almost surely, 2^78990135165 is an apocalyptic number.

It is an amenable number.

78990135165 is a deficient number, since it is larger than the sum of its proper divisors (67693944195).

78990135165 is a wasteful number, since it uses less digits than its factorization.

78990135165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835 (or 4832 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 78990135165 in words is "seventy-eight billion, nine hundred ninety million, one hundred thirty-five thousand, one hundred sixty-five".