17920671913 has 2 divisors, whose sum is σ = 17920671914. Its totient is φ = 17920671912.

The previous prime is 17920671911. The next prime is 17920671929. The reversal of 17920671913 is 31917602971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17332512409 + 588159504 = 131653^2 + 24252^2 .

It is a cyclic number.

It is not a de Polignac number, because 17920671913 - 2¹ = 17920671911 is a prime.

It is a super-3 number, since 3×17920671913³ (a number of 32 digits) contains 333 as substring.

Together with 17920671911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (17920671911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8960335956 + 8960335957.

It is an arithmetic number, because the mean of its divisors is an integer number (8960335957).

Almost surely, 2^17920671913 is an apocalyptic number.

It is an amenable number.

17920671913 is a deficient number, since it is larger than the sum of its proper divisors (1).

17920671913 is an equidigital number, since it uses as much as digits as its factorization.

17920671913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 17920671913 in words is "seventeen billion, nine hundred twenty million, six hundred seventy-one thousand, nine hundred thirteen".