79221911669 has 4 divisors (see below), whose sum is σ = 79223377344. Its totient is φ = 79220445996.

The previous prime is 79221911651. The next prime is 79221911693. The reversal of 79221911669 is 96611912297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96611912297 = 45887 ⋅2105431.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79221911669 is a prime.

It is a super-2 number, since 2×79221911669² (a number of 23 digits) contains 22 as substring.

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 79221911669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79221911609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648527 + ... + 760940.

It is an arithmetic number, because the mean of its divisors is an integer number (19805844336).

Almost surely, 2^79221911669 is an apocalyptic number.

It is an amenable number.

79221911669 is a deficient number, since it is larger than the sum of its proper divisors (1465675).

79221911669 is a wasteful number, since it uses less digits than its factorization.

79221911669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465674.

The product of its digits is 734832, while the sum is 53.

The spelling of 79221911669 in words is "seventy-nine billion, two hundred twenty-one million, nine hundred eleven thousand, six hundred sixty-nine".