81852255132637 has 16 divisors (see below), whose sum is σ = 93184720387200. Its totient is φ = 71168975539200.

The previous prime is 81852255132601. The next prime is 81852255132649. The reversal of 81852255132637 is 73623155225818.

It is a happy number.

It is not a de Polignac number, because 81852255132637 - 2¹⁵ = 81852255099869 is a prime.

It is a super-2 number, since 2×81852255132637² (a number of 29 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 (81852255132737) 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, 13062012 + ... + 18284437.

It is an arithmetic number, because the mean of its divisors is an integer number (5824045024200).

Almost surely, 2^{81852255132637} is an apocalyptic number.

It is an amenable number.

81852255132637 is a deficient number, since it is larger than the sum of its proper divisors (11332465254563).

81852255132637 is a wasteful number, since it uses less digits than its factorization.

81852255132637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31356804.

The product of its digits is 24192000, while the sum is 58.

The spelling of 81852255132637 in words is "eighty-one trillion, eight hundred fifty-two billion, two hundred fifty-five million, one hundred thirty-two thousand, six hundred thirty-seven".