81017038823 has 32 divisors (see below), whose sum is σ = 95393894400. Its totient is φ = 67380977664.

The previous prime is 81017038813. The next prime is 81017038847. The reversal of 81017038823 is 32883071018.

It is not a de Polignac number, because 81017038823 - 2⁴ = 81017038807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81017038813) 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, 8214311 + ... + 8224167.

It is an arithmetic number, because the mean of its divisors is an integer number (2981059200).

Almost surely, 2^81017038823 is an apocalyptic number.

81017038823 is a deficient number, since it is larger than the sum of its proper divisors (14376855577).

81017038823 is a wasteful number, since it uses less digits than its factorization.

81017038823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 81017038823 in words is "eighty-one billion, seventeen million, thirty-eight thousand, eight hundred twenty-three".