79839781919 has 8 divisors (see below), whose sum is σ = 80352938160. Its totient is φ = 79326910656.

The previous prime is 79839781913. The next prime is 79839781933. The reversal of 79839781919 is 91918793897.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79839781919 - 2³² = 75544814623 is a prime.

It is a super-3 number, since 3×79839781919³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79839781913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505829 + ... + 644625.

It is an arithmetic number, because the mean of its divisors is an integer number (10044117270).

Almost surely, 2^79839781919 is an apocalyptic number.

79839781919 is a deficient number, since it is larger than the sum of its proper divisors (513156241).

79839781919 is a wasteful number, since it uses less digits than its factorization.

79839781919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142489.

The product of its digits is 61725888, while the sum is 71.

It can be divided in two parts, 7983978 and 1919, that added together give a palindrome (7985897).

The spelling of 79839781919 in words is "seventy-nine billion, eight hundred thirty-nine million, seven hundred eighty-one thousand, nine hundred nineteen".