61515666664984 has 64 divisors (see below), whose sum is σ = 140955276029760. Its totient is φ = 24567368294400.

The previous prime is 61515666664981. The next prime is 61515666664993. The reversal of 61515666664984 is 48946666651516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61515666664981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319791457 + ... + 319983760.

It is an arithmetic number, because the mean of its divisors is an integer number (2202426187965).

Almost surely, 2^{61515666664984} is an apocalyptic number.

It is an amenable number.

61515666664984 is an abundant number, since it is smaller than the sum of its proper divisors (79439609364776).

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

61515666664984 is a wasteful number, since it uses less digits than its factorization.

61515666664984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639775348 (or 639775344 counting only the distinct ones).

The product of its digits is 1343692800, while the sum is 73.

The spelling of 61515666664984 in words is "sixty-one trillion, five hundred fifteen billion, six hundred sixty-six million, six hundred sixty-four thousand, nine hundred eighty-four".