61978074975 has 18 divisors (see below), whose sum is σ = 111009619136. Its totient is φ = 33054973200.

The previous prime is 61978074937. The next prime is 61978074997. The reversal of 61978074975 is 57947087916.

61978074975 is a `hidden beast` number, since 61 + 9 + 7 + 80 + 7 + 497 + 5 = 666.

It is not a de Polignac number, because 61978074975 - 2¹⁴ = 61978058591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 137728831 + ... + 137729280.

Almost surely, 2^61978074975 is an apocalyptic number.

61978074975 is a deficient number, since it is larger than the sum of its proper divisors (49031544161).

61978074975 is a wasteful number, since it uses less digits than its factorization.

61978074975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275458127 (or 275458119 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 63.

The spelling of 61978074975 in words is "sixty-one billion, nine hundred seventy-eight million, seventy-four thousand, nine hundred seventy-five".