61939639976 has 16 divisors (see below), whose sum is σ = 116240258400. Its totient is φ = 30942237744.

The previous prime is 61939639967. The next prime is 61939639981. The reversal of 61939639976 is 67993693916.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3438236 + ... + 3456203.

It is an arithmetic number, because the mean of its divisors is an integer number (7265016150).

Almost surely, 2^61939639976 is an apocalyptic number.

It is an amenable number.

61939639976 is a deficient number, since it is larger than the sum of its proper divisors (54300618424).

61939639976 is a wasteful number, since it uses less digits than its factorization.

61939639976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895568 (or 6895564 counting only the distinct ones).

The product of its digits is 89282088, while the sum is 68.

The spelling of 61939639976 in words is "sixty-one billion, nine hundred thirty-nine million, six hundred thirty-nine thousand, nine hundred seventy-six".