61939595971 has 4 divisors (see below), whose sum is σ = 67570468344. Its totient is φ = 56308723600.

The previous prime is 61939595959. The next prime is 61939595981. The reversal of 61939595971 is 17959593916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61939595971 - 2²⁵ = 61906041539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61939595941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2815436170 + ... + 2815436191.

It is an arithmetic number, because the mean of its divisors is an integer number (16892617086).

Almost surely, 2^61939595971 is an apocalyptic number.

61939595971 is a deficient number, since it is larger than the sum of its proper divisors (5630872373).

61939595971 is a wasteful number, since it uses less digits than its factorization.

61939595971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5630872372.

The product of its digits is 20667150, while the sum is 64.

The spelling of 61939595971 in words is "sixty-one billion, nine hundred thirty-nine million, five hundred ninety-five thousand, nine hundred seventy-one".