16646532688831 has 2 divisors, whose sum is σ = 16646532688832. Its totient is φ = 16646532688830.

The previous prime is 16646532688789. The next prime is 16646532688871. The reversal of 16646532688831 is 13888623564661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16646532688831 - 2⁷ = 16646532688703 is a prime.

It is a super-2 number, since 2×16646532688831² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16646532688871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8323266344415 + 8323266344416.

It is an arithmetic number, because the mean of its divisors is an integer number (8323266344416).

Almost surely, 2^{16646532688831} is an apocalyptic number.

16646532688831 is a deficient number, since it is larger than the sum of its proper divisors (1).

16646532688831 is an equidigital number, since it uses as much as digits as its factorization.

16646532688831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238878720, while the sum is 67.

The spelling of 16646532688831 in words is "sixteen trillion, six hundred forty-six billion, five hundred thirty-two million, six hundred eighty-eight thousand, eight hundred thirty-one".