81854180839741 has 16 divisors (see below), whose sum is σ = 86726092262400. Its totient is φ = 77039473518000.

The previous prime is 81854180839727. The next prime is 81854180839777. The reversal of 81854180839741 is 14793808145818.

It is a cyclic number.

It is not a de Polignac number, because 81854180839741 - 2⁵ = 81854180839709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81854181839741) 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, 7875445 + ... + 15024346.

It is an arithmetic number, because the mean of its divisors is an integer number (5420380766400).

Almost surely, 2^{81854180839741} is an apocalyptic number.

It is an amenable number.

81854180839741 is a deficient number, since it is larger than the sum of its proper divisors (4871911422659).

81854180839741 is a wasteful number, since it uses less digits than its factorization.

81854180839741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22901040.

The product of its (nonzero) digits is 61931520, while the sum is 67.

The spelling of 81854180839741 in words is "eighty-one trillion, eight hundred fifty-four billion, one hundred eighty million, eight hundred thirty-nine thousand, seven hundred forty-one".