661275192 has 16 divisors (see below), whose sum is σ = 1653188040. Its totient is φ = 220425056.

The previous prime is 661275187. The next prime is 661275227. The reversal of 661275192 is 291572166.

It is a self number, because there is not a number n which added to its sum of digits gives 661275192.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13776543 + ... + 13776590.

Almost surely, 2^661275192 is an apocalyptic number.

It is an amenable number.

661275192 is an abundant number, since it is smaller than the sum of its proper divisors (991912848).

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

661275192 is a wasteful number, since it uses less digits than its factorization.

661275192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27553142 (or 27553138 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 661275192 is about 25715.2715715779. The cubic root of 661275192 is about 871.2191442778.

The spelling of 661275192 in words is "six hundred sixty-one million, two hundred seventy-five thousand, one hundred ninety-two".