81858040705254 has 32 divisors (see below), whose sum is σ = 184360631270400. Its totient is φ = 24005290528800.

The previous prime is 81858040705139. The next prime is 81858040705291. The reversal of 81858040705254 is 45250704085818.

It is a super-3 number, since 3×81858040705254³ (a number of 43 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81858040705194 and 81858040705203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20004406729 + ... + 20004410820.

It is an arithmetic number, because the mean of its divisors is an integer number (5761269727200).

Almost surely, 2^{81858040705254} is an apocalyptic number.

81858040705254 is an abundant number, since it is smaller than the sum of its proper divisors (102502590565146).

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

81858040705254 is a wasteful number, since it uses less digits than its factorization.

81858040705254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40008817596.

The product of its (nonzero) digits is 14336000, while the sum is 57.

The spelling of 81858040705254 in words is "eighty-one trillion, eight hundred fifty-eight billion, forty million, seven hundred five thousand, two hundred fifty-four".