661364464 has 40 divisors (see below), whose sum is σ = 1428189840. Its totient is φ = 294847488.

The previous prime is 661364449. The next prime is 661364567. The reversal of 661364464 is 464463166.

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, 58819 + ... + 69154.

It is an arithmetic number, because the mean of its divisors is an integer number (35704746).

Almost surely, 2^661364464 is an apocalyptic number.

It is an amenable number.

661364464 is an abundant number, since it is smaller than the sum of its proper divisors (766825376).

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

661364464 is a wasteful number, since it uses less digits than its factorization.

661364464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128017 (or 128011 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

The square root of 661364464 is about 25717.0072908960. The cubic root of 661364464 is about 871.2583473090.

The spelling of 661364464 in words is "six hundred sixty-one million, three hundred sixty-four thousand, four hundred sixty-four".