1815109638788 has 24 divisors (see below), whose sum is σ = 3374871847200. Its totient is φ = 851753363328.

The previous prime is 1815109638779. The next prime is 1815109638821. The reversal of 1815109638788 is 8878369015181.

It is a super-2 number, since 2×1815109638788² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111594773 + ... + 111611036.

It is an arithmetic number, because the mean of its divisors is an integer number (140619660300).

Almost surely, 2^{1815109638788} is an apocalyptic number.

It is an amenable number.

1815109638788 is a deficient number, since it is larger than the sum of its proper divisors (1559762208412).

1815109638788 is a wasteful number, since it uses less digits than its factorization.

1815109638788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223205939 (or 223205937 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 65.

The spelling of 1815109638788 in words is "one trillion, eight hundred fifteen billion, one hundred nine million, six hundred thirty-eight thousand, seven hundred eighty-eight".