78137258481 has 6 divisors (see below), whose sum is σ = 112864928930. Its totient is φ = 52091505648.

The previous prime is 78137258477. The next prime is 78137258501. The reversal of 78137258481 is 18485273187.

78137258481 is a `hidden beast` number, since 7 + 8 + 137 + 25 + 8 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 74115162081 + 4022096400 = 272241^2 + 63420^2 .

It is not a de Polignac number, because 78137258481 - 2² = 78137258477 is a prime.

It is a super-2 number, since 2×78137258481² (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 (78137258401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4340958796 + ... + 4340958813.

Almost surely, 2^78137258481 is an apocalyptic number.

It is an amenable number.

78137258481 is a deficient number, since it is larger than the sum of its proper divisors (34727670449).

78137258481 is a wasteful number, since it uses less digits than its factorization.

78137258481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8681917615 (or 8681917612 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The spelling of 78137258481 in words is "seventy-eight billion, one hundred thirty-seven million, two hundred fifty-eight thousand, four hundred eighty-one".