81635362048779 has 32 divisors (see below), whose sum is σ = 136233574119936. Its totient is φ = 42242968657920.

The previous prime is 81635362048727. The next prime is 81635362048787. The reversal of 81635362048779 is 97784026353618.

It is not a de Polignac number, because 81635362048779 - 2²⁰ = 81635361000203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81635362048579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 687488952 + ... + 687607685.

It is an arithmetic number, because the mean of its divisors is an integer number (4257299191248).

It is a 2-persistent number, because it is pandigital, and so is 2⋅81635362048779 = 163270724097558, but 3⋅81635362048779 = 244906086146337 is not.

Almost surely, 2^{81635362048779} is an apocalyptic number.

81635362048779 is a deficient number, since it is larger than the sum of its proper divisors (54598212071157).

81635362048779 is a wasteful number, since it uses less digits than its factorization.

81635362048779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375096915.

The product of its (nonzero) digits is 365783040, while the sum is 69.

The spelling of 81635362048779 in words is "eighty-one trillion, six hundred thirty-five billion, three hundred sixty-two million, forty-eight thousand, seven hundred seventy-nine".