18525535644 has 384 divisors, whose sum is σ = 57905971200. Its totient is φ = 4563820800.

The previous prime is 18525535631. The next prime is 18525535649. The reversal of 18525535644 is 44653552581.

It is a super-2 number, since 2×18525535644² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18525535593 and 18525535602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18525535649) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 94038154 + ... + 94038350.

It is an arithmetic number, because the mean of its divisors is an integer number (150796800).

Almost surely, 2^18525535644 is an apocalyptic number.

18525535644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18525535644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28952985600).

18525535644 is an abundant number, since it is smaller than the sum of its proper divisors (39380435556).

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

18525535644 is a wasteful number, since it uses less digits than its factorization.

18525535644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 318 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 48.

The spelling of 18525535644 in words is "eighteen billion, five hundred twenty-five million, five hundred thirty-five thousand, six hundred forty-four".