657342561 has 16 divisors (see below), whose sum is σ = 894910464. Its totient is φ = 429080784.

The previous prime is 657342559. The next prime is 657342617. The reversal of 657342561 is 165243756.

It is not a de Polignac number, because 657342561 - 2¹ = 657342559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (657342551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23776 + ... + 43358.

It is an arithmetic number, because the mean of its divisors is an integer number (55931904).

Almost surely, 2^657342561 is an apocalyptic number.

It is an amenable number.

657342561 is a deficient number, since it is larger than the sum of its proper divisors (237567903).

657342561 is a wasteful number, since it uses less digits than its factorization.

657342561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19820.

The product of its digits is 151200, while the sum is 39.

The square root of 657342561 is about 25638.6926538777. The cubic root of 657342561 is about 869.4886504934.

The spelling of 657342561 in words is "six hundred fifty-seven million, three hundred forty-two thousand, five hundred sixty-one".