7959891605 has 4 divisors (see below), whose sum is σ = 9551869932. Its totient is φ = 6367913280.

The previous prime is 7959891601. The next prime is 7959891631. The reversal of 7959891605 is 5061989597.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2383685329 + 5576206276 = 48823^2 + 74674^2 .

It is not a de Polignac number, because 7959891605 - 2² = 7959891601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7959891601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 795989156 + ... + 795989165.

It is an arithmetic number, because the mean of its divisors is an integer number (2387967483).

Almost surely, 2^7959891605 is an apocalyptic number.

It is an amenable number.

7959891605 is a deficient number, since it is larger than the sum of its proper divisors (1591978327).

7959891605 is a wasteful number, since it uses less digits than its factorization.

7959891605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591978326.

The product of its (nonzero) digits is 6123600, while the sum is 59.

The square root of 7959891605 is about 89218.2246236720. The cubic root of 7959891605 is about 1996.6520324338.

The spelling of 7959891605 in words is "seven billion, nine hundred fifty-nine million, eight hundred ninety-one thousand, six hundred five".