81190637399223 has 48 divisors (see below), whose sum is σ = 128087521545984. Its totient is φ = 49148482596480.

The previous prime is 81190637399171. The next prime is 81190637399231. The reversal of 81190637399223 is 32299373609118.

81190637399223 is a `hidden beast` number, since 8 + 1 + 19 + 0 + 6 + 3 + 7 + 399 + 223 = 666.

It is not a de Polignac number, because 81190637399223 - 2³⁸ = 80915759492279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81190637399233) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 501334140 + ... + 501496062.

It is an arithmetic number, because the mean of its divisors is an integer number (2668490032208).

Almost surely, 2^{81190637399223} is an apocalyptic number.

81190637399223 is a deficient number, since it is larger than the sum of its proper divisors (46896884146761).

81190637399223 is a wasteful number, since it uses less digits than its factorization.

81190637399223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167876 (or 167873 counting only the distinct ones).

The product of its (nonzero) digits is 26453952, while the sum is 63.

The spelling of 81190637399223 in words is "eighty-one trillion, one hundred ninety billion, six hundred thirty-seven million, three hundred ninety-nine thousand, two hundred twenty-three".