661413952 has 28 divisors (see below), whose sum is σ = 1317266860. Its totient is φ = 329504256.

The previous prime is 661413947. The next prime is 661413979. The reversal of 661413952 is 259314166.

It can be written as a sum of positive squares in 2 ways, for example, as 211295296 + 450118656 = 14536^2 + 21216^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927 + ... + 36382.

It is an arithmetic number, because the mean of its divisors is an integer number (47045245).

Almost surely, 2^661413952 is an apocalyptic number.

It is an amenable number.

661413952 is a deficient number, since it is larger than the sum of its proper divisors (655852908).

661413952 is a wasteful number, since it uses less digits than its factorization.

661413952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37598 (or 37588 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 661413952 is about 25717.9694377297. The cubic root of 661413952 is about 871.2800780187.

The spelling of 661413952 in words is "six hundred sixty-one million, four hundred thirteen thousand, nine hundred fifty-two".