661870914 has 32 divisors (see below), whose sum is σ = 1340344320. Its totient is φ = 217873152.

The previous prime is 661870841. The next prime is 661870939. The reversal of 661870914 is 419078166.

661870914 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172602 + ... + 176394.

It is an arithmetic number, because the mean of its divisors is an integer number (41885760).

Almost surely, 2^661870914 is an apocalyptic number.

661870914 is an abundant number, since it is smaller than the sum of its proper divisors (678473406).

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

661870914 is a wasteful number, since it uses less digits than its factorization.

661870914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 661870914 is about 25726.8520033058. The cubic root of 661870914 is about 871.4806837215.

The spelling of 661870914 in words is "six hundred sixty-one million, eight hundred seventy thousand, nine hundred fourteen".