61660738724 has 48 divisors (see below), whose sum is σ = 122123187648. Its totient is φ = 27045664128.

The previous prime is 61660738673. The next prime is 61660738757. The reversal of 61660738724 is 42783706616.

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, 289922 + ... + 455385.

It is an arithmetic number, because the mean of its divisors is an integer number (2544233076).

Almost surely, 2^61660738724 is an apocalyptic number.

It is an amenable number.

61660738724 is a deficient number, since it is larger than the sum of its proper divisors (60462448924).

61660738724 is a wasteful number, since it uses less digits than its factorization.

61660738724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745404 (or 745402 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 61660738724 in words is "sixty-one billion, six hundred sixty million, seven hundred thirty-eight thousand, seven hundred twenty-four".