660406506164 has 12 divisors (see below), whose sum is σ = 1171543049124. Its totient is φ = 325679920704.

The previous prime is 660406506139. The next prime is 660406506269. The reversal of 660406506164 is 461605604066.

It can be written as a sum of positive squares in 2 ways, for example, as 571977589264 + 88428916900 = 756292^2 + 297370^2 .

It is a super-2 number, since 2×660406506164² (a number of 24 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1130832767 + ... + 1130833350.

It is an arithmetic number, because the mean of its divisors is an integer number (97628587427).

Almost surely, 2^660406506164 is an apocalyptic number.

It is an amenable number.

660406506164 is a deficient number, since it is larger than the sum of its proper divisors (511136542960).

660406506164 is a wasteful number, since it uses less digits than its factorization.

660406506164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261666194 (or 2261666192 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 660406506164 in words is "six hundred sixty billion, four hundred six million, five hundred six thousand, one hundred sixty-four".