657043361 has 8 divisors (see below), whose sum is σ = 710524584. Its totient is φ = 603982080.

The previous prime is 657043349. The next prime is 657043391. The reversal of 657043361 is 163340756.

It can be written as a sum of positive squares in 4 ways, for example, as 42003361 + 615040000 = 6481^2 + 24800^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 657043361 - 2¹⁸ = 656781217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657043391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101726 + ... + 107991.

It is an arithmetic number, because the mean of its divisors is an integer number (88815573).

Almost surely, 2^657043361 is an apocalyptic number.

It is an amenable number.

657043361 is a deficient number, since it is larger than the sum of its proper divisors (53481223).

657043361 is a wasteful number, since it uses less digits than its factorization.

657043361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209971.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 657043361 is about 25632.8570588610. The cubic root of 657043361 is about 869.3567099090.

The spelling of 657043361 in words is "six hundred fifty-seven million, forty-three thousand, three hundred sixty-one".