671337657 has 12 divisors (see below), whose sum is σ = 995918820. Its totient is φ = 435462048.

The previous prime is 671337637. The next prime is 671337671. The reversal of 671337657 is 756733176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 554178681 + 117158976 = 23541^2 + 10824^2 .

It is not a de Polignac number, because 671337657 - 2¹² = 671333561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671337637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1007682 + ... + 1008347.

It is an arithmetic number, because the mean of its divisors is an integer number (82993235).

Almost surely, 2^671337657 is an apocalyptic number.

It is an amenable number.

671337657 is a deficient number, since it is larger than the sum of its proper divisors (324581163).

671337657 is a wasteful number, since it uses less digits than its factorization.

671337657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016072 (or 2016069 counting only the distinct ones).

The product of its digits is 555660, while the sum is 45.

The square root of 671337657 is about 25910.1844262058. The cubic root of 671337657 is about 875.6159611733.

The spelling of 671337657 in words is "six hundred seventy-one million, three hundred thirty-seven thousand, six hundred fifty-seven".