661910514 has 32 divisors (see below), whose sum is σ = 1384781184. Its totient is φ = 210524160.

The previous prime is 661910503. The next prime is 661910527. The reversal of 661910514 is 415019166.

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, 52402 + ... + 63794.

It is an arithmetic number, because the mean of its divisors is an integer number (43274412).

Almost surely, 2^661910514 is an apocalyptic number.

661910514 is an abundant number, since it is smaller than the sum of its proper divisors (722870670).

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

661910514 is a wasteful number, since it uses less digits than its factorization.

661910514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11842.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 661910514 is about 25727.6216156877. The cubic root of 661910514 is about 871.4980637201.

The spelling of 661910514 in words is "six hundred sixty-one million, nine hundred ten thousand, five hundred fourteen".