61660247472 has 120 divisors (see below), whose sum is σ = 174077952048. Its totient is φ = 20373350400.

The previous prime is 61660247459. The next prime is 61660247479. The reversal of 61660247472 is 27474206616.

61660247472 is a `hidden beast` number, since 616 + 6 + 0 + 24 + 7 + 4 + 7 + 2 = 666.

It is a super-2 number, since 2×61660247472² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61660247479) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27030972 + ... + 27033252.

Almost surely, 2^61660247472 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 61660247472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87038976024).

61660247472 is an abundant number, since it is smaller than the sum of its proper divisors (112417704576).

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

61660247472 is a wasteful number, since it uses less digits than its factorization.

61660247472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859 (or 3850 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 61660247472 in words is "sixty-one billion, six hundred sixty million, two hundred forty-seven thousand, four hundred seventy-two".