78274839681 has 12 divisors (see below), whose sum is σ = 113246320720. Its totient is φ = 52098920280.

The previous prime is 78274839679. The next prime is 78274839689. The reversal of 78274839681 is 18693847287.

78274839681 is a `hidden beast` number, since 78 + 2 + 7 + 483 + 9 + 6 + 81 = 666.

It is not a de Polignac number, because 78274839681 - 2¹ = 78274839679 is a prime.

It is a super-2 number, since 2×78274839681² (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 (78274839689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7019635 + ... + 7030776.

Almost surely, 2^78274839681 is an apocalyptic number.

It is an amenable number.

78274839681 is a deficient number, since it is larger than the sum of its proper divisors (34971481039).

78274839681 is a wasteful number, since it uses less digits than its factorization.

78274839681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14051036 (or 14051033 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 78274839681 in words is "seventy-eight billion, two hundred seventy-four million, eight hundred thirty-nine thousand, six hundred eighty-one".