18400027516 has 24 divisors (see below), whose sum is σ = 34709762304. Its totient is φ = 8484290880.

The previous prime is 18400027511. The next prime is 18400027553. The reversal of 18400027516 is 61572000481.

It is a super-2 number, since 2×18400027516² (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 (18400027511) 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, 111580 + ... + 221923.

It is an arithmetic number, because the mean of its divisors is an integer number (1446240096).

Almost surely, 2^18400027516 is an apocalyptic number.

It is an amenable number.

18400027516 is a deficient number, since it is larger than the sum of its proper divisors (16309734788).

18400027516 is a wasteful number, since it uses less digits than its factorization.

18400027516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334581 (or 334579 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 18400027516 its reverse (61572000481), we get a palindrome (79972027997).

The spelling of 18400027516 in words is "eighteen billion, four hundred million, twenty-seven thousand, five hundred sixteen".