81673770141 has 48 divisors (see below), whose sum is σ = 123771945024. Its totient is φ = 51848266752.

The previous prime is 81673770133. The next prime is 81673770163. The reversal of 81673770141 is 14107737618.

81673770141 is a `hidden beast` number, since 81 + 67 + 377 + 0 + 141 = 666.

It is not a de Polignac number, because 81673770141 - 2³ = 81673770133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81673770641) 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, 2943565 + ... + 2971181.

It is an arithmetic number, because the mean of its divisors is an integer number (2578582188).

Almost surely, 2^81673770141 is an apocalyptic number.

It is an amenable number.

81673770141 is a deficient number, since it is larger than the sum of its proper divisors (42098174883).

81673770141 is a wasteful number, since it uses less digits than its factorization.

81673770141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27850 (or 27847 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The spelling of 81673770141 in words is "eighty-one billion, six hundred seventy-three million, seven hundred seventy thousand, one hundred forty-one".