81901894741166 has 8 divisors (see below), whose sum is σ = 122879648331504. Its totient is φ = 40942011964000.

The previous prime is 81901894741129. The next prime is 81901894741201. The reversal of 81901894741166 is 66114749810918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81901894741166² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4467691835 + ... + 4467710166.

It is an arithmetic number, because the mean of its divisors is an integer number (15359956041438).

Almost surely, 2^{81901894741166} is an apocalyptic number.

81901894741166 is a deficient number, since it is larger than the sum of its proper divisors (40977753590338).

81901894741166 is a wasteful number, since it uses less digits than its factorization.

81901894741166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8935406586.

The product of its (nonzero) digits is 20901888, while the sum is 65.

The spelling of 81901894741166 in words is "eighty-one trillion, nine hundred one billion, eight hundred ninety-four million, seven hundred forty-one thousand, one hundred sixty-six".