657121164 has 36 divisors (see below), whose sum is σ = 1783616184. Its totient is φ = 187748736.

The previous prime is 657121163. The next prime is 657121169. The reversal of 657121164 is 461121756.

It is not an unprimeable number, because it can be changed into a prime (657121163) 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 11 ways as a sum of consecutive naturals, for example, 558189 + ... + 559364.

It is an arithmetic number, because the mean of its divisors is an integer number (49544894).

Almost surely, 2^657121164 is an apocalyptic number.

It is an amenable number.

657121164 is an abundant number, since it is smaller than the sum of its proper divisors (1126495020).

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

657121164 is a wasteful number, since it uses less digits than its factorization.

657121164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117574 (or 1117565 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 657121164 is about 25634.3746559186. The cubic root of 657121164 is about 869.3910231647.

The spelling of 657121164 in words is "six hundred fifty-seven million, one hundred twenty-one thousand, one hundred sixty-four".