657475134921 has 24 divisors (see below), whose sum is σ = 1070635976480. Its totient is φ = 398469776760.

The previous prime is 657475134907. The next prime is 657475134947. The reversal of 657475134921 is 129431574756.

657475134921 is a `hidden beast` number, since 6 + 5 + 74 + 75 + 13 + 492 + 1 = 666.

It is not a de Polignac number, because 657475134921 - 2²⁹ = 656938264009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657475134971) 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 23 ways as a sum of consecutive naturals, for example, 100620415 + ... + 100626948.

Almost surely, 2^657475134921 is an apocalyptic number.

It is an amenable number.

657475134921 is a deficient number, since it is larger than the sum of its proper divisors (413160841559).

657475134921 is a wasteful number, since it uses less digits than its factorization.

657475134921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201247394 (or 201247377 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The spelling of 657475134921 in words is "six hundred fifty-seven billion, four hundred seventy-five million, one hundred thirty-four thousand, nine hundred twenty-one".