84079117781 has 4 divisors (see below), whose sum is σ = 84181280352. Its totient is φ = 83976955212.

The previous prime is 84079117679. The next prime is 84079117789. The reversal of 84079117781 is 18771197048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84079117781 - 2²⁶ = 84012008917 is a prime.

It is a super-2 number, since 2×84079117781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84079117789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51080051 + ... + 51081696.

It is an arithmetic number, because the mean of its divisors is an integer number (21045320088).

Almost surely, 2^84079117781 is an apocalyptic number.

It is an amenable number.

84079117781 is a deficient number, since it is larger than the sum of its proper divisors (102162571).

84079117781 is a wasteful number, since it uses less digits than its factorization.

84079117781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102162570.

The product of its (nonzero) digits is 790272, while the sum is 53.

The spelling of 84079117781 in words is "eighty-four billion, seventy-nine million, one hundred seventeen thousand, seven hundred eighty-one".