665880405745841 has 16 divisors (see below), whose sum is σ = 788264766894528. Its totient is φ = 554515258065600.

The previous prime is 665880405745813. The next prime is 665880405745913. The reversal of 665880405745841 is 148547504088566.

It is a de Polignac number, because none of the positive numbers 2^k-665880405745841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665880405735841) 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 in 15 ways as a sum of consecutive naturals, for example, 17772906206 + ... + 17772943671.

It is an arithmetic number, because the mean of its divisors is an integer number (49266547930908).

Almost surely, 2^{665880405745841} is an apocalyptic number.

It is an amenable number.

665880405745841 is a deficient number, since it is larger than the sum of its proper divisors (122384361148687).

665880405745841 is a wasteful number, since it uses less digits than its factorization.

665880405745841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35545850032.

The product of its (nonzero) digits is 1032192000, while the sum is 71.

The spelling of 665880405745841 in words is "six hundred sixty-five trillion, eight hundred eighty billion, four hundred five million, seven hundred forty-five thousand, eight hundred forty-one".