823108471581 has 16 divisors (see below), whose sum is σ = 1204417847808. Its totient is φ = 495866468400.

The previous prime is 823108471531. The next prime is 823108471607. The reversal of 823108471581 is 185174801328.

It is not a de Polignac number, because 823108471581 - 2¹⁹ = 823107947293 is a prime.

It is a super-2 number, since 2×823108471581² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 823108471581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823108471531) 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, 74673175 + ... + 74684196.

It is an arithmetic number, because the mean of its divisors is an integer number (75276115488).

Almost surely, 2^823108471581 is an apocalyptic number.

It is an amenable number.

823108471581 is a deficient number, since it is larger than the sum of its proper divisors (381309376227).

823108471581 is a wasteful number, since it uses less digits than its factorization.

823108471581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149357552.

The product of its (nonzero) digits is 430080, while the sum is 48.

The spelling of 823108471581 in words is "eight hundred twenty-three billion, one hundred eight million, four hundred seventy-one thousand, five hundred eighty-one".