61500015564 has 24 divisors (see below), whose sum is σ = 154538501040. Its totient is φ = 18923081664.

The previous prime is 61500015553. The next prime is 61500015581. The reversal of 61500015564 is 46551000516.

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, 197115279 + ... + 197115590.

It is an arithmetic number, because the mean of its divisors is an integer number (6439104210).

Almost surely, 2^61500015564 is an apocalyptic number.

It is an amenable number.

61500015564 is an abundant number, since it is smaller than the sum of its proper divisors (93038485476).

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

61500015564 is a wasteful number, since it uses less digits than its factorization.

61500015564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394230889 (or 394230887 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 61500015564 in words is "sixty-one billion, five hundred million, fifteen thousand, five hundred sixty-four".