78311771818056 has 96 divisors (see below), whose sum is σ = 244617373915200. Its totient is φ = 22169518611840.

The previous prime is 78311771818051. The next prime is 78311771818103. The reversal of 78311771818056 is 65081817711387.

78311771818056 is a `hidden beast` number, since 78 + 311 + 7 + 71 + 8 + 180 + 5 + 6 = 666.

It is a super-2 number, since 2×78311771818056² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 78311771817984 and 78311771818002.

It is not an unprimeable number, because it can be changed into a prime (78311771818051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712699650 + ... + 712809521.

It is an arithmetic number, because the mean of its divisors is an integer number (2548097644950).

Almost surely, 2^{78311771818056} is an apocalyptic number.

It is an amenable number.

78311771818056 is an abundant number, since it is smaller than the sum of its proper divisors (166305602097144).

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

78311771818056 is a wasteful number, since it uses less digits than its factorization.

78311771818056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425509299 (or 1425509292 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 63.

The spelling of 78311771818056 in words is "seventy-eight trillion, three hundred eleven billion, seven hundred seventy-one million, eight hundred eighteen thousand, fifty-six".