83778296591 has 16 divisors (see below), whose sum is σ = 94639190400. Its totient is φ = 73463359200.

The previous prime is 83778296587. The next prime is 83778296653. The reversal of 83778296591 is 19569287738.

It is not a de Polignac number, because 83778296591 - 2² = 83778296587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83778296531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196196 + ... + 453926.

It is an arithmetic number, because the mean of its divisors is an integer number (5914949400).

Almost surely, 2^83778296591 is an apocalyptic number.

83778296591 is a deficient number, since it is larger than the sum of its proper divisors (10860893809).

83778296591 is a wasteful number, since it uses less digits than its factorization.

83778296591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258790.

The product of its digits is 45722880, while the sum is 65.

The spelling of 83778296591 in words is "eighty-three billion, seven hundred seventy-eight million, two hundred ninety-six thousand, five hundred ninety-one".