166890157769 has 2 divisors, whose sum is σ = 166890157770. Its totient is φ = 166890157768.

The previous prime is 166890157757. The next prime is 166890157793. The reversal of 166890157769 is 967751098661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120992665600 + 45897492169 = 347840^2 + 214237^2 .

It is an emirp because it is prime and its reverse (967751098661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166890157769 - 2³⁶ = 98170681033 is a prime.

It is a super-2 number, since 2×166890157769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166890157729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83445078884 + 83445078885.

It is an arithmetic number, because the mean of its divisors is an integer number (83445078885).

Almost surely, 2^166890157769 is an apocalyptic number.

It is an amenable number.

166890157769 is a deficient number, since it is larger than the sum of its proper divisors (1).

166890157769 is an equidigital number, since it uses as much as digits as its factorization.

166890157769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 65.

The spelling of 166890157769 in words is "one hundred sixty-six billion, eight hundred ninety million, one hundred fifty-seven thousand, seven hundred sixty-nine".