671801657 has 2 divisors, whose sum is σ = 671801658. Its totient is φ = 671801656.

The previous prime is 671801623. The next prime is 671801681. The reversal of 671801657 is 756108176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 527345296 + 144456361 = 22964^2 + 12019^2 .

It is a cyclic number.

It is not a de Polignac number, because 671801657 - 2¹⁴ = 671785273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671851657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335900828 + 335900829.

It is an arithmetic number, because the mean of its divisors is an integer number (335900829).

Almost surely, 2^671801657 is an apocalyptic number.

It is an amenable number.

671801657 is a deficient number, since it is larger than the sum of its proper divisors (1).

671801657 is an equidigital number, since it uses as much as digits as its factorization.

671801657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 671801657 is about 25919.1368876357. The cubic root of 671801657 is about 875.8176442038.

The spelling of 671801657 in words is "six hundred seventy-one million, eight hundred one thousand, six hundred fifty-seven".