81142253222143 has 8 divisors (see below), whose sum is σ = 83029421640528. Its totient is φ = 79255091134464.

The previous prime is 81142253222137. The next prime is 81142253222207. The reversal of 81142253222143 is 34122235224118.

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

It is a cyclic number.

It is not a de Polignac number, because 81142253222143 - 2⁵ = 81142253222111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81142253222096 and 81142253222105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81142253220143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33072621 + ... + 35441257.

It is an arithmetic number, because the mean of its divisors is an integer number (10378677705066).

Almost surely, 2^{81142253222143} is an apocalyptic number.

81142253222143 is a deficient number, since it is larger than the sum of its proper divisors (1887168418385).

81142253222143 is a wasteful number, since it uses less digits than its factorization.

81142253222143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165353.

The product of its digits is 184320, while the sum is 40.

The spelling of 81142253222143 in words is "eighty-one trillion, one hundred forty-two billion, two hundred fifty-three million, two hundred twenty-two thousand, one hundred forty-three".