76991222221 has 16 divisors (see below), whose sum is σ = 79279361280. Its totient is φ = 74743223040.

The previous prime is 76991222213. The next prime is 76991222237. The reversal of 76991222221 is 12222219967.

It is a cyclic number.

It is not a de Polignac number, because 76991222221 - 2³ = 76991222213 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 (76991222201) 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, 1618545 + ... + 1665433.

It is an arithmetic number, because the mean of its divisors is an integer number (4954960080).

Almost surely, 2^76991222221 is an apocalyptic number.

It is an amenable number.

76991222221 is a deficient number, since it is larger than the sum of its proper divisors (2288139059).

76991222221 is a wasteful number, since it uses less digits than its factorization.

76991222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47316.

The product of its digits is 108864, while the sum is 43.

The spelling of 76991222221 in words is "seventy-six billion, nine hundred ninety-one million, two hundred twenty-two thousand, two hundred twenty-one".