17959991401 has 48 divisors (see below), whose sum is σ = 20686305024. Its totient is φ = 15567552000.

The previous prime is 17959991359. The next prime is 17959991449. The reversal of 17959991401 is 10419995971.

It is not a de Polignac number, because 17959991401 - 2²⁹ = 17423120489 is a prime.

It is a super-2 number, since 2×17959991401² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17959991201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66272896 + ... + 66273166.

It is an arithmetic number, because the mean of its divisors is an integer number (430964688).

Almost surely, 2^17959991401 is an apocalyptic number.

17959991401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17959991401 is a deficient number, since it is larger than the sum of its proper divisors (2726313623).

17959991401 is a wasteful number, since it uses less digits than its factorization.

17959991401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 55.

The spelling of 17959991401 in words is "seventeen billion, nine hundred fifty-nine million, nine hundred ninety-one thousand, four hundred one".