61717861716 has 48 divisors (see below), whose sum is σ = 171736664064. Its totient is φ = 16866992736.

The previous prime is 61717861679. The next prime is 61717861783. The reversal of 61717861716 is 61716871716.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15970600 + ... + 15974463.

It is an arithmetic number, because the mean of its divisors is an integer number (3577847168).

Almost surely, 2^61717861716 is an apocalyptic number.

It is an amenable number.

61717861716 is an abundant number, since it is smaller than the sum of its proper divisors (110018802348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61717861716 is a wasteful number, since it uses less digits than its factorization.

61717861716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31945100 (or 31945098 counting only the distinct ones).

The product of its digits is 592704, while the sum is 51.

The spelling of 61717861716 in words is "sixty-one billion, seven hundred seventeen million, eight hundred sixty-one thousand, seven hundred sixteen".