670681757 has 2 divisors, whose sum is σ = 670681758. Its totient is φ = 670681756.

The previous prime is 670681727. The next prime is 670681783. The reversal of 670681757 is 757186076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645871396 + 24810361 = 25414^2 + 4981^2 .

It is a cyclic number.

It is not a de Polignac number, because 670681757 - 2¹² = 670677661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670681727) 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, 335340878 + 335340879.

It is an arithmetic number, because the mean of its divisors is an integer number (335340879).

Almost surely, 2^670681757 is an apocalyptic number.

It is an amenable number.

670681757 is a deficient number, since it is larger than the sum of its proper divisors (1).

670681757 is an equidigital number, since it uses as much as digits as its factorization.

670681757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493920, while the sum is 47.

The square root of 670681757 is about 25897.5241480725. The cubic root of 670681757 is about 875.3307079721.

The spelling of 670681757 in words is "six hundred seventy million, six hundred eighty-one thousand, seven hundred fifty-seven".