661314365 has 16 divisors (see below), whose sum is σ = 843197040. Its totient is φ = 497912320.

The previous prime is 661314349. The next prime is 661314391. The reversal of 661314365 is 563413166.

It can be written as a sum of positive squares in 8 ways, for example, as 74269924 + 587044441 = 8618^2 + 24229^2 .

It is not a de Polignac number, because 661314365 - 2⁴ = 661314349 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 11105 + ... + 38025.

It is an arithmetic number, because the mean of its divisors is an integer number (52699815).

Almost surely, 2^661314365 is an apocalyptic number.

It is an amenable number.

661314365 is a deficient number, since it is larger than the sum of its proper divisors (181882675).

661314365 is an equidigital number, since it uses as much as digits as its factorization.

661314365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26977 (or 26943 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 661314365 is about 25716.0332283189. The cubic root of 661314365 is about 871.2363471983.

The spelling of 661314365 in words is "six hundred sixty-one million, three hundred fourteen thousand, three hundred sixty-five".