61715604672 has 112 divisors (see below), whose sum is σ = 183097525600. Its totient is φ = 20383073280.

The previous prime is 61715604647. The next prime is 61715604707. The reversal of 61715604672 is 27640651716.

61715604672 is a `hidden beast` number, since 6 + 17 + 1 + 560 + 4 + 6 + 72 = 666.

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, 24522 + ... + 352182.

Almost surely, 2^61715604672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61715604672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91548762800).

61715604672 is an abundant number, since it is smaller than the sum of its proper divisors (121381920928).

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

61715604672 is a wasteful number, since it uses less digits than its factorization.

61715604672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327791 (or 327775 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 61715604672 in words is "sixty-one billion, seven hundred fifteen million, six hundred four thousand, six hundred seventy-two".