81837261606 has 16 divisors (see below), whose sum is σ = 164086806384. Its totient is φ = 27210373344.

The previous prime is 81837261601. The next prime is 81837261613. The reversal of 81837261606 is 60616273818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837261601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17175885 + ... + 17180648.

It is an arithmetic number, because the mean of its divisors is an integer number (10255425399).

Almost surely, 2^81837261606 is an apocalyptic number.

81837261606 is an abundant number, since it is smaller than the sum of its proper divisors (82249544778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81837261606 is a wasteful number, since it uses less digits than its factorization.

81837261606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34356935.

The product of its (nonzero) digits is 580608, while the sum is 48.

It can be divided in two parts, 818372 and 61606, that added together give a palindrome (879978).

The spelling of 81837261606 in words is "eighty-one billion, eight hundred thirty-seven million, two hundred sixty-one thousand, six hundred six".