61660511500 has 48 divisors (see below), whose sum is σ = 153904645440. Its totient is φ = 21140745600.

The previous prime is 61660511431. The next prime is 61660511567. The reversal of 61660511500 is 511506616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8805145 + ... + 8812144.

It is an arithmetic number, because the mean of its divisors is an integer number (3206346780).

Almost surely, 2^61660511500 is an apocalyptic number.

It is an amenable number.

61660511500 is an abundant number, since it is smaller than the sum of its proper divisors (92244133940).

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

61660511500 is a wasteful number, since it uses less digits than its factorization.

61660511500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17617315 (or 17617303 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 61660511500 in words is "sixty-one billion, six hundred sixty million, five hundred eleven thousand, five hundred".