81367814366 has 16 divisors (see below), whose sum is σ = 125381376960. Its totient is φ = 39574565280.

The previous prime is 81367814327. The next prime is 81367814369. The reversal of 81367814366 is 66341876318.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81367814369) 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, 170480 + ... + 437948.

It is an arithmetic number, because the mean of its divisors is an integer number (7836336060).

Almost surely, 2^81367814366 is an apocalyptic number.

81367814366 is a deficient number, since it is larger than the sum of its proper divisors (44013562594).

81367814366 is a wasteful number, since it uses less digits than its factorization.

81367814366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271619.

The product of its digits is 3483648, while the sum is 53.

The spelling of 81367814366 in words is "eighty-one billion, three hundred sixty-seven million, eight hundred fourteen thousand, three hundred sixty-six".