17981813025 has 72 divisors (see below), whose sum is σ = 36309446880. Its totient is φ = 8718415200.

The previous prime is 17981812991. The next prime is 17981813071. The reversal of 17981813025 is 52031818971.

It is not a de Polignac number, because 17981813025 - 2⁷ = 17981812897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 28407 + ... + 191756.

Almost surely, 2^17981813025 is an apocalyptic number.

17981813025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17981813025 is an abundant number, since it is smaller than the sum of its proper divisors (18327633855).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17981813025 is a wasteful number, since it uses less digits than its factorization.

17981813025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220204 (or 220182 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 17981813025 in words is "seventeen billion, nine hundred eighty-one million, eight hundred thirteen thousand, twenty-five".