670691257 has 2 divisors, whose sum is σ = 670691258. Its totient is φ = 670691256.

The previous prime is 670691237. The next prime is 670691261. The reversal of 670691257 is 752196076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 526427136 + 144264121 = 22944^2 + 12011^2 .

It is a cyclic number.

It is not a de Polignac number, because 670691257 - 2¹⁵ = 670658489 is a prime.

It is not a weakly prime, because it can be changed into another prime (670691227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335345628 + 335345629.

It is an arithmetic number, because the mean of its divisors is an integer number (335345629).

Almost surely, 2^670691257 is an apocalyptic number.

It is an amenable number.

670691257 is a deficient number, since it is larger than the sum of its proper divisors (1).

670691257 is an equidigital number, since it uses as much as digits as its factorization.

670691257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 670691257 is about 25897.7075626396. The cubic root of 670691257 is about 875.3348408823.

The spelling of 670691257 in words is "six hundred seventy million, six hundred ninety-one thousand, two hundred fifty-seven".