78651591969 has 16 divisors (see below), whose sum is σ = 110793150720. Its totient is φ = 49549153920.

The previous prime is 78651591883. The next prime is 78651591989. The reversal of 78651591969 is 96919515687.

It is not a de Polignac number, because 78651591969 - 2³² = 74356624673 is a prime.

It is a super-2 number, since 2×78651591969² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78651591989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9613372 + ... + 9621549.

It is an arithmetic number, because the mean of its divisors is an integer number (6924571920).

Almost surely, 2^78651591969 is an apocalyptic number.

It is an amenable number.

78651591969 is a deficient number, since it is larger than the sum of its proper divisors (32141558751).

78651591969 is a wasteful number, since it uses less digits than its factorization.

78651591969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19235000.

The product of its digits is 36741600, while the sum is 66.

The spelling of 78651591969 in words is "seventy-eight billion, six hundred fifty-one million, five hundred ninety-one thousand, nine hundred sixty-nine".