16611313643 has 2 divisors, whose sum is σ = 16611313644. Its totient is φ = 16611313642.

The previous prime is 16611313639. The next prime is 16611313679. The reversal of 16611313643 is 34631311661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16611313643 - 2² = 16611313639 is a prime.

It is a super-2 number, since 2×16611313643² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16611313603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305656821 + 8305656822.

It is an arithmetic number, because the mean of its divisors is an integer number (8305656822).

Almost surely, 2^16611313643 is an apocalyptic number.

16611313643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16611313643 is an equidigital number, since it uses as much as digits as its factorization.

16611313643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The spelling of 16611313643 in words is "sixteen billion, six hundred eleven million, three hundred thirteen thousand, six hundred forty-three".