7991548621 has 24 divisors (see below), whose sum is σ = 9627991296. Its totient is φ = 6606956160.

The previous prime is 7991548601. The next prime is 7991548627. The reversal of 7991548621 is 1268451997.

It is not a de Polignac number, because 7991548621 - 2²³ = 7983160013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991548627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457765 + ... + 474901.

It is an arithmetic number, because the mean of its divisors is an integer number (401166304).

Almost surely, 2^7991548621 is an apocalyptic number.

It is an amenable number.

7991548621 is a deficient number, since it is larger than the sum of its proper divisors (1636442675).

7991548621 is a wasteful number, since it uses less digits than its factorization.

7991548621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17489 (or 17482 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The square root of 7991548621 is about 89395.4619709524. The cubic root of 7991548621 is about 1999.2954702647.

The spelling of 7991548621 in words is "seven billion, nine hundred ninety-one million, five hundred forty-eight thousand, six hundred twenty-one".