669573591541 has 2 divisors, whose sum is σ = 669573591542. Its totient is φ = 669573591540.

The previous prime is 669573591493. The next prime is 669573591553. The reversal of 669573591541 is 145195375966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 501681807025 + 167891784516 = 708295^2 + 409746^2 .

It is a cyclic number.

It is not a de Polignac number, because 669573591541 - 2⁷ = 669573591413 is a prime.

It is a super-2 number, since 2×669573591541² (a number of 24 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 669573591541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669573591571) 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, 334786795770 + 334786795771.

It is an arithmetic number, because the mean of its divisors is an integer number (334786795771).

Almost surely, 2^669573591541 is an apocalyptic number.

It is an amenable number.

669573591541 is a deficient number, since it is larger than the sum of its proper divisors (1).

669573591541 is an equidigital number, since it uses as much as digits as its factorization.

669573591541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618000, while the sum is 61.

The spelling of 669573591541 in words is "six hundred sixty-nine billion, five hundred seventy-three million, five hundred ninety-one thousand, five hundred forty-one".