17920671943 has 2 divisors, whose sum is σ = 17920671944. Its totient is φ = 17920671942.

The previous prime is 17920671929. The next prime is 17920672027. The reversal of 17920671943 is 34917602971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17920671943 - 2⁵ = 17920671911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17920671913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8960335971 + 8960335972.

It is an arithmetic number, because the mean of its divisors is an integer number (8960335972).

Almost surely, 2^17920671943 is an apocalyptic number.

17920671943 is a deficient number, since it is larger than the sum of its proper divisors (1).

17920671943 is an equidigital number, since it uses as much as digits as its factorization.

17920671943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 17920671943 in words is "seventeen billion, nine hundred twenty million, six hundred seventy-one thousand, nine hundred forty-three".