78651591968 has 144 divisors (see below), whose sum is σ = 169449809760. Its totient is φ = 35834849280.

The previous prime is 78651591883. The next prime is 78651591989. The reversal of 78651591968 is 86919515687.

It is a super-2 number, since 2×78651591968² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132633080 + ... + 132633672.

It is an arithmetic number, because the mean of its divisors is an integer number (1176734790).

Almost surely, 2^78651591968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78651591968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84724904880).

78651591968 is an abundant number, since it is smaller than the sum of its proper divisors (90798217792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78651591968 is a wasteful number, since it uses less digits than its factorization.

78651591968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 872 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 65.

The spelling of 78651591968 in words is "seventy-eight billion, six hundred fifty-one million, five hundred ninety-one thousand, nine hundred sixty-eight".