7971296818 has 4 divisors (see below), whose sum is σ = 11956945230. Its totient is φ = 3985648408.

The previous prime is 7971296813. The next prime is 7971296833. The reversal of 7971296818 is 8186921797.

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

It can be written as a sum of positive squares in only one way, i.e., 6583212769 + 1388084049 = 81137^2 + 37257^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (7971296813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992824203 + ... + 1992824206.

Almost surely, 2^7971296818 is an apocalyptic number.

7971296818 is a deficient number, since it is larger than the sum of its proper divisors (3985648412).

7971296818 is a wasteful number, since it uses less digits than its factorization.

7971296818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985648411.

The product of its digits is 3048192, while the sum is 58.

The square root of 7971296818 is about 89282.1192512812. The cubic root of 7971296818 is about 1997.6052017819.

The spelling of 7971296818 in words is "seven billion, nine hundred seventy-one million, two hundred ninety-six thousand, eight hundred eighteen".