7818806512 has 20 divisors (see below), whose sum is σ = 16526114136. Its totient is φ = 3554002880.

The previous prime is 7818806509. The next prime is 7818806519. The reversal of 7818806512 is 2156088187.

It is a super-2 number, since 2×7818806512² (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 (7818806519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22212343 + ... + 22212694.

Almost surely, 2^7818806512 is an apocalyptic number.

It is an amenable number.

7818806512 is an abundant number, since it is smaller than the sum of its proper divisors (8707307624).

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

7818806512 is a wasteful number, since it uses less digits than its factorization.

7818806512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44425056 (or 44425050 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 46.

The square root of 7818806512 is about 88424.0154709115. The cubic root of 7818806512 is about 1984.7850894275.

The spelling of 7818806512 in words is "seven billion, eight hundred eighteen million, eight hundred six thousand, five hundred twelve".