1815214999956 has 48 divisors (see below), whose sum is σ = 4247830977600. Its totient is φ = 603311715072.

The previous prime is 1815214999867. The next prime is 1815214999979. The reversal of 1815214999956 is 6599994125181.

It is a super-2 number, since 2×1815214999956² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10609666 + ... + 10779398.

It is an arithmetic number, because the mean of its divisors is an integer number (88496478700).

Almost surely, 2^{1815214999956} is an apocalyptic number.

It is an amenable number.

1815214999956 is an abundant number, since it is smaller than the sum of its proper divisors (2432615977644).

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

1815214999956 is a wasteful number, since it uses less digits than its factorization.

1815214999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172328 (or 172326 counting only the distinct ones).

The product of its digits is 62985600, while the sum is 69.

The spelling of 1815214999956 in words is "one trillion, eight hundred fifteen billion, two hundred fourteen million, nine hundred ninety-nine thousand, nine hundred fifty-six".