78587776997856 has 384 divisors, whose sum is σ = 282166507929600. Its totient is φ = 20784584240640.

The previous prime is 78587776997839. The next prime is 78587776997869. The reversal of 78587776997856 is 65879967778587.

78587776997856 is a `hidden beast` number, since 7 + 8 + 587 + 7 + 7 + 6 + 9 + 9 + 7 + 8 + 5 + 6 = 666.

It is a super-2 number, since 2×78587776997856² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4799986 + ... + 13424433.

It is an arithmetic number, because the mean of its divisors is an integer number (734808614400).

Almost surely, 2^{78587776997856} is an apocalyptic number.

It is an amenable number.

78587776997856 is an abundant number, since it is smaller than the sum of its proper divisors (203578730931744).

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

78587776997856 is a wasteful number, since it uses less digits than its factorization.

78587776997856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18224499 (or 18224485 counting only the distinct ones).

The product of its digits is 627317913600, while the sum is 99.

The spelling of 78587776997856 in words is "seventy-eight trillion, five hundred eighty-seven billion, seven hundred seventy-six million, nine hundred ninety-seven thousand, eight hundred fifty-six".