661925110 has 64 divisors (see below), whose sum is σ = 1495563264. Its totient is φ = 204912000.

The previous prime is 661925023. The next prime is 661925167. The reversal of 661925110 is 11529166.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 113424 + ... + 119116.

It is an arithmetic number, because the mean of its divisors is an integer number (23368176).

Almost surely, 2^661925110 is an apocalyptic number.

661925110 is an abundant number, since it is smaller than the sum of its proper divisors (833638154).

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

661925110 is a wasteful number, since it uses less digits than its factorization.

661925110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5869.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 661925110 is about 25727.9052781217. The cubic root of 661925110 is about 871.5044695670.

The spelling of 661925110 in words is "six hundred sixty-one million, nine hundred twenty-five thousand, one hundred ten".