81000015743 has 4 divisors (see below), whose sum is σ = 81000715320. Its totient is φ = 80999316168.

The previous prime is 81000015727. The next prime is 81000015769. The reversal of 81000015743 is 34751000018.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81000015743 - 2⁴ = 81000015727 is a prime.

It is a super-2 number, since 2×81000015743² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81000015143) 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, 130133 + ... + 423006.

It is an arithmetic number, because the mean of its divisors is an integer number (20250178830).

Almost surely, 2^81000015743 is an apocalyptic number.

81000015743 is a deficient number, since it is larger than the sum of its proper divisors (699577).

81000015743 is a wasteful number, since it uses less digits than its factorization.

81000015743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699576.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 81000015743 in words is "eighty-one billion, fifteen thousand, seven hundred forty-three".