667408757 has 2 divisors, whose sum is σ = 667408758. Its totient is φ = 667408756.

The previous prime is 667408751. The next prime is 667408793. The reversal of 667408757 is 757804766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 482285521 + 185123236 = 21961^2 + 13606^2 .

It is a cyclic number.

It is not a de Polignac number, because 667408757 - 2¹⁴ = 667392373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667408751) 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, 333704378 + 333704379.

It is an arithmetic number, because the mean of its divisors is an integer number (333704379).

Almost surely, 2^667408757 is an apocalyptic number.

It is an amenable number.

667408757 is a deficient number, since it is larger than the sum of its proper divisors (1).

667408757 is an equidigital number, since it uses as much as digits as its factorization.

667408757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1975680, while the sum is 50.

The square root of 667408757 is about 25834.2554953689. The cubic root of 667408757 is about 873.9044823500.

The spelling of 667408757 in words is "six hundred sixty-seven million, four hundred eight thousand, seven hundred fifty-seven".