16667666399 has 2 divisors, whose sum is σ = 16667666400. Its totient is φ = 16667666398.

The previous prime is 16667666369. The next prime is 16667666467. The reversal of 16667666399 is 99366676661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16667666399 is a prime.

It is a super-2 number, since 2×16667666399² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16667666339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333833199 + 8333833200.

It is an arithmetic number, because the mean of its divisors is an integer number (8333833200).

Almost surely, 2^16667666399 is an apocalyptic number.

16667666399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16667666399 is an equidigital number, since it uses as much as digits as its factorization.

16667666399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79361856, while the sum is 65.

The spelling of 16667666399 in words is "sixteen billion, six hundred sixty-seven million, six hundred sixty-six thousand, three hundred ninety-nine".