79612221697 has 4 divisors (see below), whose sum is σ = 79612822276. Its totient is φ = 79611621120.

The previous prime is 79612221599. The next prime is 79612221713.

79612221697 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22225144561 + 57387077136 = 149081^2 + 239556^2 .

It is a cyclic number.

It is not a de Polignac number, because 79612221697 - 2¹¹ = 79612219649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79612221197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4008 + ... + 399049.

It is an arithmetic number, because the mean of its divisors is an integer number (19903205569).

Almost surely, 2^79612221697 is an apocalyptic number.

It is an amenable number.

79612221697 is a deficient number, since it is larger than the sum of its proper divisors (600579).

79612221697 is a wasteful number, since it uses less digits than its factorization.

79612221697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600578.

The product of its digits is 1143072, while the sum is 52.

The spelling of 79612221697 in words is "seventy-nine billion, six hundred twelve million, two hundred twenty-one thousand, six hundred ninety-seven".