81601867633741 has 32 divisors (see below), whose sum is σ = 103373182680320. Its totient is φ = 62681677963776.

The previous prime is 81601867633717. The next prime is 81601867633747. The reversal of 81601867633741 is 14733676810618.

It is a cyclic number.

It is not a de Polignac number, because 81601867633741 - 2⁷ = 81601867633613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81601867633741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81601867633747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24977451 + ... + 28054888.

It is an arithmetic number, because the mean of its divisors is an integer number (3230411958760).

Almost surely, 2^{81601867633741} is an apocalyptic number.

It is an amenable number.

81601867633741 is a deficient number, since it is larger than the sum of its proper divisors (21771315046579).

81601867633741 is a wasteful number, since it uses less digits than its factorization.

81601867633741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53032853.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 81601867633741 in words is "eighty-one trillion, six hundred one billion, eight hundred sixty-seven million, six hundred thirty-three thousand, seven hundred forty-one".