660944259361 has 4 divisors (see below), whose sum is σ = 660961266052. Its totient is φ = 660927252672.

The previous prime is 660944259337. The next prime is 660944259383. The reversal of 660944259361 is 163952449066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 429890035600 + 231054223761 = 655660^2 + 480681^2 .

It is a cyclic number.

It is not a de Polignac number, because 660944259361 - 2²³ = 660935870753 is a prime.

It is a super-2 number, since 2×660944259361² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660944259161) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8444916 + ... + 8522821.

It is an arithmetic number, because the mean of its divisors is an integer number (165240316513).

Almost surely, 2^660944259361 is an apocalyptic number.

It is an amenable number.

660944259361 is a deficient number, since it is larger than the sum of its proper divisors (17006691).

660944259361 is a wasteful number, since it uses less digits than its factorization.

660944259361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17006690.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 660944259361 in words is "six hundred sixty billion, nine hundred forty-four million, two hundred fifty-nine thousand, three hundred sixty-one".