7991760221 has 16 divisors (see below), whose sum is σ = 8632733760. Its totient is φ = 7373473920.

The previous prime is 7991760211. The next prime is 7991760233. The reversal of 7991760221 is 1220671997.

It is a cyclic number.

It is not a de Polignac number, because 7991760221 - 2¹⁸ = 7991498077 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 (7991760211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448535 + ... + 466011.

It is an arithmetic number, because the mean of its divisors is an integer number (539545860).

Almost surely, 2^7991760221 is an apocalyptic number.

It is an amenable number.

7991760221 is a deficient number, since it is larger than the sum of its proper divisors (640973539).

7991760221 is a wasteful number, since it uses less digits than its factorization.

7991760221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18124.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 7991760221 is about 89396.6454683843. The cubic root of 7991760221 is about 1999.3131158721.

The spelling of 7991760221 in words is "seven billion, nine hundred ninety-one million, seven hundred sixty thousand, two hundred twenty-one".