81190637399224 has 8 divisors (see below), whose sum is σ = 152232445123560. Its totient is φ = 40595318699608.

The previous prime is 81190637399171. The next prime is 81190637399231. The reversal of 81190637399224 is 42299373609118.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5074414837444 + ... + 5074414837459.

It is an arithmetic number, because the mean of its divisors is an integer number (19029055640445).

Almost surely, 2^{81190637399224} is an apocalyptic number.

It is an amenable number.

81190637399224 is a deficient number, since it is larger than the sum of its proper divisors (71041807724336).

81190637399224 is a wasteful number, since it uses less digits than its factorization.

81190637399224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148829674909 (or 10148829674905 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 81190637399224 in words is "eighty-one trillion, one hundred ninety billion, six hundred thirty-seven million, three hundred ninety-nine thousand, two hundred twenty-four".