81064653743 has 4 divisors (see below), whose sum is σ = 81112368600. Its totient is φ = 81016938888.

The previous prime is 81064653701. The next prime is 81064653763. The reversal of 81064653743 is 34735646018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34735646018 = 2 ⋅17367823009.

It is a cyclic number.

It is not a de Polignac number, because 81064653743 - 2¹⁰ = 81064652719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81064653763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23854880 + ... + 23858277.

It is an arithmetic number, because the mean of its divisors is an integer number (20278092150).

Almost surely, 2^81064653743 is an apocalyptic number.

81064653743 is a deficient number, since it is larger than the sum of its proper divisors (47714857).

81064653743 is a wasteful number, since it uses less digits than its factorization.

81064653743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47714856.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 81064653743 in words is "eighty-one billion, sixty-four million, six hundred fifty-three thousand, seven hundred forty-three".