18075531551 has 24 divisors (see below), whose sum is σ = 23280558336. Its totient is φ = 13874580720.

The previous prime is 18075531541. The next prime is 18075531589. The reversal of 18075531551 is 15513557081.

It is a de Polignac number, because none of the positive numbers 2^k-18075531551 is a prime.

It is a hoax number, since the sum of its digits (41) 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 = 18075531499 and 18075531508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18075531541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214151 + ... + 286376.

It is an arithmetic number, because the mean of its divisors is an integer number (970023264).

Almost surely, 2^18075531551 is an apocalyptic number.

18075531551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18075531551 is a deficient number, since it is larger than the sum of its proper divisors (5205026785).

18075531551 is a wasteful number, since it uses less digits than its factorization.

18075531551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500619 (or 500612 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 41.

The spelling of 18075531551 in words is "eighteen billion, seventy-five million, five hundred thirty-one thousand, five hundred fifty-one".