7991602081 has 8 divisors (see below), whose sum is σ = 8114546624. Its totient is φ = 7868765520.

The previous prime is 7991602049. The next prime is 7991602111. The reversal of 7991602081 is 1802061997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 3-Lehmer number, since φ(7991602081) divides (7991602081-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 7991602081 - 2⁵ = 7991602049 is a prime.

It is a super-2 number, since 2×7991602081² (a number of 21 digits) contains 22 as substring.

It is a deceptive number, since it divides R_7991602080.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7991632081) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 129031 + ... + 180643.

It is an arithmetic number, because the mean of its divisors is an integer number (1014318328).

It is a Poulet number, since it divides 2^7991602080-1.

Almost surely, 2^7991602081 is an apocalyptic number.

7991602081 is the 51613-rd octagonal number.

It is an amenable number.

7991602081 is a deficient number, since it is larger than the sum of its proper divisors (122944543).

7991602081 is a wasteful number, since it uses less digits than its factorization.

7991602081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53991.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 7991602081 is about 89395.7609789189. The cubic root of 7991602081 is about 1999.2999283951.

The spelling of 7991602081 in words is "seven billion, nine hundred ninety-one million, six hundred two thousand, eighty-one".