61716871715 has 8 divisors (see below), whose sum is σ = 74102649360. Its totient is φ = 49345228512.

The previous prime is 61716871709. The next prime is 61716871751. The reversal of 61716871715 is 51717861716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61716871715 is a prime.

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, 3524000 + ... + 3541469.

It is an arithmetic number, because the mean of its divisors is an integer number (9262831170).

Almost surely, 2^61716871715 is an apocalyptic number.

61716871715 is a deficient number, since it is larger than the sum of its proper divisors (12385777645).

61716871715 is a wasteful number, since it uses less digits than its factorization.

61716871715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067221.

The product of its digits is 493920, while the sum is 50.

Subtracting from 61716871715 its reverse (51717861716), we obtain a palindrome (9999009999).

The spelling of 61716871715 in words is "sixty-one billion, seven hundred sixteen million, eight hundred seventy-one thousand, seven hundred fifteen".