61571517616 has 30 divisors (see below), whose sum is σ = 138771521700. Its totient is φ = 26387792928.

The previous prime is 61571517613. The next prime is 61571517671. The reversal of 61571517616 is 61671517516.

It is not an unprimeable number, because it can be changed into a prime (61571517613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39266766 + ... + 39268333.

It is an arithmetic number, because the mean of its divisors is an integer number (4625717390).

Almost surely, 2^61571517616 is an apocalyptic number.

It is an amenable number.

61571517616 is an abundant number, since it is smaller than the sum of its proper divisors (77200004084).

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

61571517616 is a wasteful number, since it uses less digits than its factorization.

61571517616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78535121 (or 78535108 counting only the distinct ones).

The product of its digits is 264600, while the sum is 46.

The spelling of 61571517616 in words is "sixty-one billion, five hundred seventy-one million, five hundred seventeen thousand, six hundred sixteen".