79213021669 has 2 divisors, whose sum is σ = 79213021670. Its totient is φ = 79213021668.

The previous prime is 79213021663. The next prime is 79213021691. The reversal of 79213021669 is 96612031297.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77221184769 + 1991836900 = 277887^2 + 44630^2 .

It is a cyclic number.

It is not a de Polignac number, because 79213021669 - 2⁷ = 79213021541 is a prime.

It is a super-2 number, since 2×79213021669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79213021663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39606510834 + 39606510835.

It is an arithmetic number, because the mean of its divisors is an integer number (39606510835).

Almost surely, 2^79213021669 is an apocalyptic number.

It is an amenable number.

79213021669 is a deficient number, since it is larger than the sum of its proper divisors (1).

79213021669 is an equidigital number, since it uses as much as digits as its factorization.

79213021669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 79213021669 in words is "seventy-nine billion, two hundred thirteen million, twenty-one thousand, six hundred sixty-nine".