61715739873 has 16 divisors (see below), whose sum is σ = 83790040320. Its totient is φ = 40398716304.

The previous prime is 61715739857. The next prime is 61715739929. The reversal of 61715739873 is 37893751716.

It is not a de Polignac number, because 61715739873 - 2⁴ = 61715739857 is a prime.

It is a super-2 number, since 2×61715739873² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61715739823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 719703 + ... + 800876.

It is an arithmetic number, because the mean of its divisors is an integer number (5236877520).

Almost surely, 2^61715739873 is an apocalyptic number.

It is an amenable number.

61715739873 is a deficient number, since it is larger than the sum of its proper divisors (22074300447).

61715739873 is a wasteful number, since it uses less digits than its factorization.

61715739873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520828.

The product of its digits is 6667920, while the sum is 57.

The spelling of 61715739873 in words is "sixty-one billion, seven hundred fifteen million, seven hundred thirty-nine thousand, eight hundred seventy-three".