82505233381 has 4 divisors (see below), whose sum is σ = 82521949932. Its totient is φ = 82488516832.

The previous prime is 82505233379. The next prime is 82505233441. The reversal of 82505233381 is 18333250528.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53423388225 + 29081845156 = 231135^2 + 170534^2 .

It is a cyclic number.

It is not a de Polignac number, because 82505233381 - 2¹ = 82505233379 is a prime.

It is a super-2 number, since 2×82505233381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82505234381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8350870 + ... + 8360743.

It is an arithmetic number, because the mean of its divisors is an integer number (20630487483).

Almost surely, 2^82505233381 is an apocalyptic number.

It is an amenable number.

82505233381 is a deficient number, since it is larger than the sum of its proper divisors (16716551).

82505233381 is a wasteful number, since it uses less digits than its factorization.

82505233381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16716550.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 82505233381 in words is "eighty-two billion, five hundred five million, two hundred thirty-three thousand, three hundred eighty-one".