670957993 has 2 divisors, whose sum is σ = 670957994. Its totient is φ = 670957992.

The previous prime is 670957961. The next prime is 670957999. The reversal of 670957993 is 399759076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 582353424 + 88604569 = 24132^2 + 9413^2 .

It is a cyclic number.

It is not a de Polignac number, because 670957993 - 2⁵ = 670957961 is a prime.

It is not a weakly prime, because it can be changed into another prime (670957999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335478996 + 335478997.

It is an arithmetic number, because the mean of its divisors is an integer number (335478997).

Almost surely, 2^670957993 is an apocalyptic number.

It is an amenable number.

670957993 is a deficient number, since it is larger than the sum of its proper divisors (1).

670957993 is an equidigital number, since it uses as much as digits as its factorization.

670957993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3214890, while the sum is 55.

The square root of 670957993 is about 25902.8568501623. The cubic root of 670957993 is about 875.4508666325.

The spelling of 670957993 in words is "six hundred seventy million, nine hundred fifty-seven thousand, nine hundred ninety-three".