17991253441 has 32 divisors (see below), whose sum is σ = 21828245760. Its totient is φ = 14507424000.

The previous prime is 17991253409. The next prime is 17991253477. The reversal of 17991253441 is 14435219971.

It is a cyclic number.

It is not a de Polignac number, because 17991253441 - 2⁵ = 17991253409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17991253391 and 17991253400.

It is not an unprimeable number, because it can be changed into a prime (17991253481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 922491 + ... + 941791.

It is an arithmetic number, because the mean of its divisors is an integer number (682132680).

Almost surely, 2^17991253441 is an apocalyptic number.

It is an amenable number.

17991253441 is a deficient number, since it is larger than the sum of its proper divisors (3836992319).

17991253441 is a wasteful number, since it uses less digits than its factorization.

17991253441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19465.

The product of its digits is 272160, while the sum is 46.

The spelling of 17991253441 in words is "seventeen billion, nine hundred ninety-one million, two hundred fifty-three thousand, four hundred forty-one".