745668857 has 2 divisors, whose sum is σ = 745668858. Its totient is φ = 745668856.

The previous prime is 745668853. The next prime is 745668877. The reversal of 745668857 is 758866547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377758096 + 367910761 = 19436^2 + 19181^2 .

It is a cyclic number.

It is not a de Polignac number, because 745668857 - 2² = 745668853 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (745668853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372834428 + 372834429.

It is an arithmetic number, because the mean of its divisors is an integer number (372834429).

Almost surely, 2^745668857 is an apocalyptic number.

It is an amenable number.

745668857 is a deficient number, since it is larger than the sum of its proper divisors (1).

745668857 is an equidigital number, since it uses as much as digits as its factorization.

745668857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11289600, while the sum is 56.

The square root of 745668857 is about 27306.9378913125. The cubic root of 745668857 is about 906.8079835924.

The spelling of 745668857 in words is "seven hundred forty-five million, six hundred sixty-eight thousand, eight hundred fifty-seven".