17920671929 has 2 divisors, whose sum is σ = 17920671930. Its totient is φ = 17920671928.

The previous prime is 17920671913. The next prime is 17920671943. The reversal of 17920671929 is 92917602971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13894515625 + 4026156304 = 117875^2 + 63452^2 .

It is an emirp because it is prime and its reverse (92917602971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17920671929 - 2⁴ = 17920671913 is a prime.

It is not a weakly prime, because it can be changed into another prime (17920671229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8960335964 + 8960335965.

It is an arithmetic number, because the mean of its divisors is an integer number (8960335965).

Almost surely, 2^17920671929 is an apocalyptic number.

It is an amenable number.

17920671929 is a deficient number, since it is larger than the sum of its proper divisors (1).

17920671929 is an equidigital number, since it uses as much as digits as its factorization.

17920671929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 17920671929 in words is "seventeen billion, nine hundred twenty million, six hundred seventy-one thousand, nine hundred twenty-nine".