81729266099594 has 16 divisors (see below), whose sum is σ = 123134542130016. Its totient is φ = 40684420424400.

The previous prime is 81729266099531. The next prime is 81729266099597. The reversal of 81729266099594 is 49599066292718.

It is not an unprimeable number, because it can be changed into a prime (81729266099597) 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, 179820809 + ... + 180274739.

It is an arithmetic number, because the mean of its divisors is an integer number (7695908883126).

Almost surely, 2^{81729266099594} is an apocalyptic number.

81729266099594 is a deficient number, since it is larger than the sum of its proper divisors (41405276030422).

81729266099594 is a wasteful number, since it uses less digits than its factorization.

81729266099594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850741.

The product of its (nonzero) digits is 1058158080, while the sum is 77.

The spelling of 81729266099594 in words is "eighty-one trillion, seven hundred twenty-nine billion, two hundred sixty-six million, ninety-nine thousand, five hundred ninety-four".