79778594221 has 8 divisors (see below), whose sum is σ = 80084519424. Its totient is φ = 79472986320.

The previous prime is 79778594197. The next prime is 79778594237. The reversal of 79778594221 is 12249587797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79778594221 - 2¹³ = 79778586029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79778594221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79778594521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430756 + ... + 587458.

It is an arithmetic number, because the mean of its divisors is an integer number (10010564928).

Almost surely, 2^79778594221 is an apocalyptic number.

It is an amenable number.

79778594221 is a deficient number, since it is larger than the sum of its proper divisors (305925203).

79778594221 is a wasteful number, since it uses less digits than its factorization.

79778594221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158651.

The product of its digits is 17781120, while the sum is 61.

The spelling of 79778594221 in words is "seventy-nine billion, seven hundred seventy-eight million, five hundred ninety-four thousand, two hundred twenty-one".