7993512081 has 32 divisors (see below), whose sum is σ = 12547802880. Its totient is φ = 5011953408.

The previous prime is 7993512071. The next prime is 7993512139. The reversal of 7993512081 is 1802153997.

7993512081 is a `hidden beast` number, since 7 + 99 + 351 + 208 + 1 = 666.

It is not a de Polignac number, because 7993512081 - 2⁶ = 7993512017 is a prime.

It is a super-2 number, since 2×7993512081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7993512061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 732195 + ... + 743031.

It is an arithmetic number, because the mean of its divisors is an integer number (392118840).

Almost surely, 2^7993512081 is an apocalyptic number.

It is an amenable number.

7993512081 is a deficient number, since it is larger than the sum of its proper divisors (4554290799).

7993512081 is a wasteful number, since it uses less digits than its factorization.

7993512081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12470 (or 12464 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 7993512081 is about 89406.4431738563. The cubic root of 7993512081 is about 1999.4591938609.

The spelling of 7993512081 in words is "seven billion, nine hundred ninety-three million, five hundred twelve thousand, eighty-one".