16677321917 has 2 divisors, whose sum is σ = 16677321918. Its totient is φ = 16677321916.

The previous prime is 16677321911. The next prime is 16677321959. The reversal of 16677321917 is 71912377661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11604891076 + 5072430841 = 107726^2 + 71221^2 .

It is an emirp because it is prime and its reverse (71912377661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16677321917 - 2¹⁰ = 16677320893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16677321911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8338660958 + 8338660959.

It is an arithmetic number, because the mean of its divisors is an integer number (8338660959).

Almost surely, 2^16677321917 is an apocalyptic number.

It is an amenable number.

16677321917 is a deficient number, since it is larger than the sum of its proper divisors (1).

16677321917 is an equidigital number, since it uses as much as digits as its factorization.

16677321917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 50.

The spelling of 16677321917 in words is "sixteen billion, six hundred seventy-seven million, three hundred twenty-one thousand, nine hundred seventeen".