77149822221 has 40 divisors (see below), whose sum is σ = 124273195200. Its totient is φ = 47537720640.

The previous prime is 77149822201. The next prime is 77149822249. The reversal of 77149822221 is 12222894177.

It is not a de Polignac number, because 77149822221 - 2⁹ = 77149821709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77149822201) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 548241 + ... + 674438.

It is an arithmetic number, because the mean of its divisors is an integer number (3106829880).

Almost surely, 2^77149822221 is an apocalyptic number.

It is an amenable number.

77149822221 is a deficient number, since it is larger than the sum of its proper divisors (47123372979).

77149822221 is a wasteful number, since it uses less digits than its factorization.

77149822221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222751 (or 1222742 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The spelling of 77149822221 in words is "seventy-seven billion, one hundred forty-nine million, eight hundred twenty-two thousand, two hundred twenty-one".