17420858891 has 2 divisors, whose sum is σ = 17420858892. Its totient is φ = 17420858890.

The previous prime is 17420858857. The next prime is 17420858929. The reversal of 17420858891 is 19885802471.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17420858891 - 2⁶ = 17420858827 is a prime.

It is not a weakly prime, because it can be changed into another prime (17420858821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8710429445 + 8710429446.

It is an arithmetic number, because the mean of its divisors is an integer number (8710429446).

Almost surely, 2^17420858891 is an apocalyptic number.

17420858891 is a deficient number, since it is larger than the sum of its proper divisors (1).

17420858891 is an equidigital number, since it uses as much as digits as its factorization.

17420858891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 17420858891 in words is "seventeen billion, four hundred twenty million, eight hundred fifty-eight thousand, eight hundred ninety-one".