84786656691 has 24 divisors (see below), whose sum is σ = 124276657680. Its totient is φ = 51379102720.

The previous prime is 84786656687. The next prime is 84786656707. The reversal of 84786656691 is 19665668748.

It is not a de Polignac number, because 84786656691 - 2² = 84786656687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84786656291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5076931 + ... + 5093603.

It is an arithmetic number, because the mean of its divisors is an integer number (5178194070).

Almost surely, 2^84786656691 is an apocalyptic number.

84786656691 is a deficient number, since it is larger than the sum of its proper divisors (39490000989).

84786656691 is a wasteful number, since it uses less digits than its factorization.

84786656691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30707 (or 30696 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 66.

The spelling of 84786656691 in words is "eighty-four billion, seven hundred eighty-six million, six hundred fifty-six thousand, six hundred ninety-one".