86821971783 has 32 divisors (see below), whose sum is σ = 120793876992. Its totient is φ = 55434288000.

The previous prime is 86821971773. The next prime is 86821971833. The reversal of 86821971783 is 38717912868.

It is not a de Polignac number, because 86821971783 - 2²⁶ = 86754862919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86821971773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1102116 + ... + 1178262.

It is an arithmetic number, because the mean of its divisors is an integer number (3774808656).

Almost surely, 2^86821971783 is an apocalyptic number.

86821971783 is a deficient number, since it is larger than the sum of its proper divisors (33971905209).

86821971783 is a wasteful number, since it uses less digits than its factorization.

86821971783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76375.

The product of its digits is 8128512, while the sum is 60.

The spelling of 86821971783 in words is "eighty-six billion, eight hundred twenty-one million, nine hundred seventy-one thousand, seven hundred eighty-three".