7959891664 has 10 divisors (see below), whose sum is σ = 15422290130. Its totient is φ = 3979945824.

The previous prime is 7959891631. The next prime is 7959891671. The reversal of 7959891664 is 4661989597.

It can be written as a sum of positive squares in only one way, i.e., 7444238400 + 515653264 = 86280^2 + 22708^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7959891596 and 7959891605.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 248746599 + ... + 248746630.

It is an arithmetic number, because the mean of its divisors is an integer number (1542229013).

Almost surely, 2^7959891664 is an apocalyptic number.

It is an amenable number.

7959891664 is a deficient number, since it is larger than the sum of its proper divisors (7462398466).

7959891664 is a wasteful number, since it uses less digits than its factorization.

7959891664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497493237 (or 497493231 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 64.

The square root of 7959891664 is about 89218.2249543220. The cubic root of 7959891664 is about 1996.6520373670.

The spelling of 7959891664 in words is "seven billion, nine hundred fifty-nine million, eight hundred ninety-one thousand, six hundred sixty-four".