670999957 has 2 divisors, whose sum is σ = 670999958. Its totient is φ = 670999956.

The previous prime is 670999949. The next prime is 670999963. The reversal of 670999957 is 759999076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553472676 + 117527281 = 23526^2 + 10841^2 .

It is a cyclic number.

It is not a de Polignac number, because 670999957 - 2³ = 670999949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 670999895 and 670999904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670999457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335499978 + 335499979.

It is an arithmetic number, because the mean of its divisors is an integer number (335499979).

Almost surely, 2^670999957 is an apocalyptic number.

It is an amenable number.

670999957 is a deficient number, since it is larger than the sum of its proper divisors (1).

670999957 is an equidigital number, since it uses as much as digits as its factorization.

670999957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9644670, while the sum is 61.

The square root of 670999957 is about 25903.6668639789. Note that the first 3 decimals coincide. The cubic root of 670999957 is about 875.4691174791.

The spelling of 670999957 in words is "six hundred seventy million, nine hundred ninety-nine thousand, nine hundred fifty-seven".