661051664236502 has 32 divisors (see below), whose sum is σ = 1236254234229504. Its totient is φ = 257552227447200.

The previous prime is 661051664236471. The next prime is 661051664236511. The reversal of 661051664236502 is 205632466150166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120947177 + ... + 126294587.

It is an arithmetic number, because the mean of its divisors is an integer number (38632944819672).

Almost surely, 2^{661051664236502} is an apocalyptic number.

661051664236502 is a deficient number, since it is larger than the sum of its proper divisors (575202569993002).

661051664236502 is a wasteful number, since it uses less digits than its factorization.

661051664236502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6150164.

The product of its (nonzero) digits is 9331200, while the sum is 53.

The spelling of 661051664236502 in words is "six hundred sixty-one trillion, fifty-one billion, six hundred sixty-four million, two hundred thirty-six thousand, five hundred two".