18497159552 has 64 divisors (see below), whose sum is σ = 38580418800. Its totient is φ = 8821929984.

The previous prime is 18497159539. The next prime is 18497159557. The reversal of 18497159552 is 25595179481.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×18497159552² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18497159557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278078 + ... + 338114.

Almost surely, 2^18497159552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18497159552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19290209400).

18497159552 is an abundant number, since it is smaller than the sum of its proper divisors (20083259248).

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

18497159552 is an equidigital number, since it uses as much as digits as its factorization.

18497159552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60163 (or 60151 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 56.

The spelling of 18497159552 in words is "eighteen billion, four hundred ninety-seven million, one hundred fifty-nine thousand, five hundred fifty-two".