166675776637 has 2 divisors, whose sum is σ = 166675776638. Its totient is φ = 166675776636.

The previous prime is 166675776629. The next prime is 166675776671. The reversal of 166675776637 is 736677576661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166650916441 + 24860196 = 408229^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 166675776637 - 2³ = 166675776629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166675773637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83337888318 + 83337888319.

It is an arithmetic number, because the mean of its divisors is an integer number (83337888319).

Almost surely, 2^166675776637 is an apocalyptic number.

It is an amenable number.

166675776637 is a deficient number, since it is larger than the sum of its proper divisors (1).

166675776637 is an equidigital number, since it uses as much as digits as its factorization.

166675776637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 280052640, while the sum is 67.

The spelling of 166675776637 in words is "one hundred sixty-six billion, six hundred seventy-five million, seven hundred seventy-six thousand, six hundred thirty-seven".