61978084564 has 24 divisors (see below), whose sum is σ = 119819548800. Its totient is φ = 27815249280.

The previous prime is 61978084523. The next prime is 61978084573. The reversal of 61978084564 is 46548087916.

61978084564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 61978084499 and 61978084508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8911669 + ... + 8918620.

It is an arithmetic number, because the mean of its divisors is an integer number (4992481200).

Almost surely, 2^61978084564 is an apocalyptic number.

It is an amenable number.

61978084564 is a deficient number, since it is larger than the sum of its proper divisors (57841464236).

61978084564 is a wasteful number, since it uses less digits than its factorization.

61978084564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17830383 (or 17830381 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 61978084564 in words is "sixty-one billion, nine hundred seventy-eight million, eighty-four thousand, five hundred sixty-four".