84245679181 has 4 divisors (see below), whose sum is σ = 84246459264. Its totient is φ = 84244899100.

The previous prime is 84245679149. The next prime is 84245679211. The reversal of 84245679181 is 18197654248.

It is the 118495-th star number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 84245679181 - 2⁵ = 84245679149 is a prime.

It is a super-2 number, since 2×84245679181² (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 (84245679781) 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, 195805 + ... + 454786.

It is an arithmetic number, because the mean of its divisors is an integer number (21061614816).

Almost surely, 2^84245679181 is an apocalyptic number.

It is an amenable number.

84245679181 is a deficient number, since it is larger than the sum of its proper divisors (780083).

84245679181 is a wasteful number, since it uses less digits than its factorization.

84245679181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780082.

The product of its digits is 3870720, while the sum is 55.

The spelling of 84245679181 in words is "eighty-four billion, two hundred forty-five million, six hundred seventy-nine thousand, one hundred eighty-one".