17921064277 has 2 divisors, whose sum is σ = 17921064278. Its totient is φ = 17921064276.

The previous prime is 17921064269. The next prime is 17921064281. The reversal of 17921064277 is 77246012971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13126055761 + 4795008516 = 114569^2 + 69246^2 .

It is a cyclic number.

It is not a de Polignac number, because 17921064277 - 2³ = 17921064269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17921062277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8960532138 + 8960532139.

It is an arithmetic number, because the mean of its divisors is an integer number (8960532139).

Almost surely, 2^17921064277 is an apocalyptic number.

It is an amenable number.

17921064277 is a deficient number, since it is larger than the sum of its proper divisors (1).

17921064277 is an equidigital number, since it uses as much as digits as its factorization.

17921064277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The spelling of 17921064277 in words is "seventeen billion, nine hundred twenty-one million, sixty-four thousand, two hundred seventy-seven".