661496910582 has 16 divisors (see below), whose sum is σ = 1323038108160. Its totient is φ = 220491589032.

The previous prime is 661496910559. The next prime is 661496910637. The reversal of 661496910582 is 285019694166.

It is a congruent number.

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, 1649518 + ... + 2010945.

It is an arithmetic number, because the mean of its divisors is an integer number (82689881760).

Almost surely, 2^661496910582 is an apocalyptic number.

661496910582 is an abundant number, since it is smaller than the sum of its proper divisors (661541197578).

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

661496910582 is a wasteful number, since it uses less digits than its factorization.

661496910582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690587.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 661496910582 in words is "six hundred sixty-one billion, four hundred ninety-six million, nine hundred ten thousand, five hundred eighty-two".