661650496 has 28 divisors (see below), whose sum is σ = 1413961612. Its totient is φ = 305376768.

The previous prime is 661650481. The next prime is 661650553. The reversal of 661650496 is 694056166.

It can be written as a sum of positive squares in 2 ways, for example, as 325441600 + 336208896 = 18040^2 + 18336^2 .

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 3 ways as a sum of consecutive naturals, for example, 396795 + ... + 398458.

It is an arithmetic number, because the mean of its divisors is an integer number (50498629).

Almost surely, 2^661650496 is an apocalyptic number.

It is an amenable number.

661650496 is an abundant number, since it is smaller than the sum of its proper divisors (752311116).

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

661650496 is a wasteful number, since it uses less digits than its factorization.

661650496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795278 (or 795268 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 661650496 is about 25722.5678344912. The cubic root of 661650496 is about 871.3839320475.

The spelling of 661650496 in words is "six hundred sixty-one million, six hundred fifty thousand, four hundred ninety-six".