16617665391377 has 2 divisors, whose sum is σ = 16617665391378. Its totient is φ = 16617665391376.

The previous prime is 16617665391359. The next prime is 16617665391421. The reversal of 16617665391377 is 77319356671661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16596041982976 + 21623408401 = 4073824^2 + 147049^2 .

It is a cyclic number.

It is not a de Polignac number, because 16617665391377 - 2¹⁴ = 16617665374993 is a prime.

It is a super-2 number, since 2×16617665391377² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16617665390377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8308832695688 + 8308832695689.

It is an arithmetic number, because the mean of its divisors is an integer number (8308832695689).

Almost surely, 2^{16617665391377} is an apocalyptic number.

It is an amenable number.

16617665391377 is a deficient number, since it is larger than the sum of its proper divisors (1).

16617665391377 is an equidigital number, since it uses as much as digits as its factorization.

16617665391377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180033840, while the sum is 68.

The spelling of 16617665391377 in words is "sixteen trillion, six hundred seventeen billion, six hundred sixty-five million, three hundred ninety-one thousand, three hundred seventy-seven".