7991463536800 has 144 divisors (see below), whose sum is σ = 21160582870392. Its totient is φ = 2935171481600.

The previous prime is 7991463536729. The next prime is 7991463536803. The reversal of 7991463536800 is 86353641997.

It can be written as a sum of positive squares in 12 ways, for example, as 789389602576 + 7202073934224 = 888476^2 + 2683668^2 .

It is not an unprimeable number, because it can be changed into a prime (7991463536803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6608347 + ... + 7723546.

Almost surely, 2^{7991463536800} is an apocalyptic number.

It is an amenable number.

7991463536800 is an abundant number, since it is smaller than the sum of its proper divisors (13169119333592).

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

7991463536800 is a wasteful number, since it uses less digits than its factorization.

7991463536800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14331971 (or 14331958 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 7991463536800 in words is "seven trillion, nine hundred ninety-one billion, four hundred sixty-three million, five hundred thirty-six thousand, eight hundred".