17666667397 has 2 divisors, whose sum is σ = 17666667398. Its totient is φ = 17666667396.

The previous prime is 17666667373. The next prime is 17666667493. The reversal of 17666667397 is 79376666671.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14457898081 + 3208769316 = 120241^2 + 56646^2 .

It is a cyclic number.

It is not a de Polignac number, because 17666667397 - 2⁷ = 17666667269 is a prime.

It is a super-2 number, since 2×17666667397² (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 (17666667307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8833333698 + 8833333699.

It is an arithmetic number, because the mean of its divisors is an integer number (8833333699).

Almost surely, 2^17666667397 is an apocalyptic number.

It is an amenable number.

17666667397 is a deficient number, since it is larger than the sum of its proper divisors (1).

17666667397 is an equidigital number, since it uses as much as digits as its factorization.

17666667397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72013536, while the sum is 64.

The spelling of 17666667397 in words is "seventeen billion, six hundred sixty-six million, six hundred sixty-seven thousand, three hundred ninety-seven".