1815181696536 has 64 divisors (see below), whose sum is σ = 4890032716800. Its totient is φ = 558174008448.

The previous prime is 1815181696519. The next prime is 1815181696597. The reversal of 1815181696536 is 6356961815181.

It is a super-2 number, since 2×1815181696536² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1815181696536.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1280296 + ... + 2295543.

It is an arithmetic number, because the mean of its divisors is an integer number (76406761200).

Almost surely, 2^{1815181696536} is an apocalyptic number.

It is an amenable number.

1815181696536 is an abundant number, since it is smaller than the sum of its proper divisors (3074851020264).

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

1815181696536 is a wasteful number, since it uses less digits than its factorization.

1815181696536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3577488 (or 3577484 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 60.

The spelling of 1815181696536 in words is "one trillion, eight hundred fifteen billion, one hundred eighty-one million, six hundred ninety-six thousand, five hundred thirty-six".