78767599321 has 16 divisors (see below), whose sum is σ = 79953885648. Its totient is φ = 77590240000.

The previous prime is 78767599289. The next prime is 78767599399. The reversal of 78767599321 is 12399576787.

It can be written as a sum of positive squares in 8 ways, for example, as 14050783296 + 64716816025 = 118536^2 + 254395^2 .

It is a cyclic number.

It is not a de Polignac number, because 78767599321 - 2⁵ = 78767599289 is a prime.

It is a super-2 number, since 2×78767599321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78767591321) 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, 20742795 + ... + 20746591.

It is an arithmetic number, because the mean of its divisors is an integer number (4997117853).

Almost surely, 2^78767599321 is an apocalyptic number.

It is an amenable number.

78767599321 is a deficient number, since it is larger than the sum of its proper divisors (1186286327).

78767599321 is a wasteful number, since it uses less digits than its factorization.

78767599321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892.

The product of its digits is 40007520, while the sum is 64.

The spelling of 78767599321 in words is "seventy-eight billion, seven hundred sixty-seven million, five hundred ninety-nine thousand, three hundred twenty-one".