665162620 has 48 divisors (see below), whose sum is σ = 1422368640. Its totient is φ = 261241344.

The previous prime is 665162549. The next prime is 665162713. The reversal of 665162620 is 26261566.

It is a super-2 number, since 2×665162620² = 884882622090528800, which 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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310192 + ... + 312328.

It is an arithmetic number, because the mean of its divisors is an integer number (29632680).

Almost surely, 2^665162620 is an apocalyptic number.

It is an amenable number.

665162620 is an abundant number, since it is smaller than the sum of its proper divisors (757206020).

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

665162620 is a wasteful number, since it uses less digits than its factorization.

665162620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422 (or 2420 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 665162620 is about 25790.7467902734. The cubic root of 665162620 is about 872.9230171792.

The spelling of 665162620 in words is "six hundred sixty-five million, one hundred sixty-two thousand, six hundred twenty".