657105138 has 24 divisors (see below), whose sum is σ = 1425430188. Its totient is φ = 218773152.

The previous prime is 657105121. The next prime is 657105151. The reversal of 657105138 is 831501756.

657105138 is a `hidden beast` number, since 6 + 571 + 0 + 51 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 656538129 + 567009 = 25623^2 + 753^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6045 + ... + 36752.

Almost surely, 2^657105138 is an apocalyptic number.

657105138 is an abundant number, since it is smaller than the sum of its proper divisors (768325050).

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

657105138 is a wasteful number, since it uses less digits than its factorization.

657105138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43658 (or 43655 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 657105138 is about 25634.0620659309. The cubic root of 657105138 is about 869.3839554809.

The spelling of 657105138 in words is "six hundred fifty-seven million, one hundred five thousand, one hundred thirty-eight".