661598927 has 16 divisors (see below), whose sum is σ = 733313952. Its totient is φ = 591851520.

The previous prime is 661598923. The next prime is 661598929. The reversal of 661598927 is 729895166.

It is a cyclic number.

It is not a de Polignac number, because 661598927 - 2² = 661598923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661598923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543023 + ... + 544239.

It is an arithmetic number, because the mean of its divisors is an integer number (45832122).

Almost surely, 2^661598927 is an apocalyptic number.

661598927 is a deficient number, since it is larger than the sum of its proper divisors (71715025).

661598927 is a wasteful number, since it uses less digits than its factorization.

661598927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978.

The product of its digits is 1632960, while the sum is 53.

The square root of 661598927 is about 25721.5654072609. The cubic root of 661598927 is about 871.3612929221.

The spelling of 661598927 in words is "six hundred sixty-one million, five hundred ninety-eight thousand, nine hundred twenty-seven".