79877697329 has 4 divisors (see below), whose sum is σ = 80021104884. Its totient is φ = 79734289776.

The previous prime is 79877697311. The next prime is 79877697331. The reversal of 79877697329 is 92379677897.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48734977600 + 31142719729 = 220760^2 + 176473^2 .

It is a cyclic number.

It is not a de Polignac number, because 79877697329 - 2¹⁶ = 79877631793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79877697379) 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, 71702942 + ... + 71704055.

It is an arithmetic number, because the mean of its divisors is an integer number (20005276221).

Almost surely, 2^79877697329 is an apocalyptic number.

It is an amenable number.

79877697329 is a deficient number, since it is larger than the sum of its proper divisors (143407555).

79877697329 is a wasteful number, since it uses less digits than its factorization.

79877697329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143407554.

The product of its digits is 504094752, while the sum is 74.

The spelling of 79877697329 in words is "seventy-nine billion, eight hundred seventy-seven million, six hundred ninety-seven thousand, three hundred twenty-nine".