78394927965 has 16 divisors (see below), whose sum is σ = 127198532736. Its totient is φ = 41221745600.

The previous prime is 78394927957. The next prime is 78394927981. The reversal of 78394927965 is 56972949387.

It is not a de Polignac number, because 78394927965 - 2³ = 78394927957 is a prime.

It is a super-2 number, since 2×78394927965² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78394927965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36804066 + ... + 36806195.

It is an arithmetic number, because the mean of its divisors is an integer number (7949908296).

Almost surely, 2^78394927965 is an apocalyptic number.

It is an amenable number.

78394927965 is a deficient number, since it is larger than the sum of its proper divisors (48803604771).

78394927965 is a wasteful number, since it uses less digits than its factorization.

78394927965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73610340.

The product of its digits is 205752960, while the sum is 69.

The spelling of 78394927965 in words is "seventy-eight billion, three hundred ninety-four million, nine hundred twenty-seven thousand, nine hundred sixty-five".