657671797 has 4 divisors (see below), whose sum is σ = 659362860. Its totient is φ = 655980736.

The previous prime is 657671731. The next prime is 657671801. The reversal of 657671797 is 797176756.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 446434641 + 211237156 = 21129^2 + 14534^2 .

It is a cyclic number.

It is not a de Polignac number, because 657671797 - 2⁷ = 657671669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657672797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844948 + ... + 845725.

It is an arithmetic number, because the mean of its divisors is an integer number (164840715).

Almost surely, 2^657671797 is an apocalyptic number.

It is an amenable number.

657671797 is a deficient number, since it is larger than the sum of its proper divisors (1691063).

657671797 is a wasteful number, since it uses less digits than its factorization.

657671797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691062.

The product of its digits is 3889620, while the sum is 55.

The square root of 657671797 is about 25645.1125363099. The cubic root of 657671797 is about 869.6337900307.

The spelling of 657671797 in words is "six hundred fifty-seven million, six hundred seventy-one thousand, seven hundred ninety-seven".