81388285333894 has 64 divisors (see below), whose sum is σ = 155448853954560. Its totient is φ = 31034297774880.

The previous prime is 81388285333891. The next prime is 81388285333969. The reversal of 81388285333894 is 49833358288318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81388285333891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369368047 + ... + 369588325.

It is an arithmetic number, because the mean of its divisors is an integer number (2428888343040).

Almost surely, 2^{81388285333894} is an apocalyptic number.

81388285333894 is a deficient number, since it is larger than the sum of its proper divisors (74060568620666).

81388285333894 is a wasteful number, since it uses less digits than its factorization.

81388285333894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271393.

The product of its digits is 955514880, while the sum is 73.

The spelling of 81388285333894 in words is "eighty-one trillion, three hundred eighty-eight billion, two hundred eighty-five million, three hundred thirty-three thousand, eight hundred ninety-four".