661623292 has 12 divisors (see below), whose sum is σ = 1263099096. Its totient is φ = 300737840.

The previous prime is 661623283. The next prime is 661623329. The reversal of 661623292 is 292326166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7518403 + ... + 7518490.

It is an arithmetic number, because the mean of its divisors is an integer number (105258258).

Almost surely, 2^661623292 is an apocalyptic number.

It is an amenable number.

661623292 is a deficient number, since it is larger than the sum of its proper divisors (601475804).

661623292 is a wasteful number, since it uses less digits than its factorization.

661623292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15036908 (or 15036906 counting only the distinct ones).

The product of its digits is 46656, while the sum is 37.

The square root of 661623292 is about 25722.0390327050. The cubic root of 661623292 is about 871.3719894617.

The spelling of 661623292 in words is "six hundred sixty-one million, six hundred twenty-three thousand, two hundred ninety-two".