79829157821 has 16 divisors (see below), whose sum is σ = 96610363776. Its totient is φ = 64393076736.

The previous prime is 79829157809. The next prime is 79829157833. The reversal of 79829157821 is 12875192897.

It is an interprime number because it is at equal distance from previous prime (79829157809) and next prime (79829157833).

It is a cyclic number.

It is not a de Polignac number, because 79829157821 - 2⁶ = 79829157757 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79829127821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1276925 + ... + 1337981.

It is an arithmetic number, because the mean of its divisors is an integer number (6038147736).

Almost surely, 2^79829157821 is an apocalyptic number.

It is an amenable number.

79829157821 is a deficient number, since it is larger than the sum of its proper divisors (16781205955).

79829157821 is a wasteful number, since it uses less digits than its factorization.

79829157821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72068.

The product of its digits is 5080320, while the sum is 59.

The spelling of 79829157821 in words is "seventy-nine billion, eight hundred twenty-nine million, one hundred fifty-seven thousand, eight hundred twenty-one".