66874425769 has 2 divisors, whose sum is σ = 66874425770. Its totient is φ = 66874425768.

The previous prime is 66874425743. The next prime is 66874425817. The reversal of 66874425769 is 96752447866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65991444544 + 882981225 = 256888^2 + 29715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66874425769 is a prime.

It is a super-2 number, since 2×66874425769² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66874425769.

It is not a weakly prime, because it can be changed into another prime (66874425269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33437212884 + 33437212885.

It is an arithmetic number, because the mean of its divisors is an integer number (33437212885).

Almost surely, 2^66874425769 is an apocalyptic number.

It is an amenable number.

66874425769 is a deficient number, since it is larger than the sum of its proper divisors (1).

66874425769 is an equidigital number, since it uses as much as digits as its factorization.

66874425769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121927680, while the sum is 64.

The spelling of 66874425769 in words is "sixty-six billion, eight hundred seventy-four million, four hundred twenty-five thousand, seven hundred sixty-nine".