16660254536641 has 2 divisors, whose sum is σ = 16660254536642. Its totient is φ = 16660254536640.

The previous prime is 16660254536633. The next prime is 16660254536671. The reversal of 16660254536641 is 14663545206661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15834000806416 + 826253730225 = 3979196^2 + 908985^2 .

It is a cyclic number.

It is not a de Polignac number, because 16660254536641 - 2³ = 16660254536633 is a prime.

It is a super-2 number, since 2×16660254536641² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16660254536621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330127268320 + 8330127268321.

It is an arithmetic number, because the mean of its divisors is an integer number (8330127268321).

Almost surely, 2^{16660254536641} is an apocalyptic number.

It is an amenable number.

16660254536641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660254536641 is an equidigital number, since it uses as much as digits as its factorization.

16660254536641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18662400, while the sum is 55.

The spelling of 16660254536641 in words is "sixteen trillion, six hundred sixty billion, two hundred fifty-four million, five hundred thirty-six thousand, six hundred forty-one".