81262796443 has 16 divisors (see below), whose sum is σ = 83873356416. Its totient is φ = 78690102400.

The previous prime is 81262796423. The next prime is 81262796477. The reversal of 81262796443 is 34469726218.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81262796443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81262796423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7651605 + ... + 7662217.

It is an arithmetic number, because the mean of its divisors is an integer number (5242084776).

Almost surely, 2^81262796443 is an apocalyptic number.

81262796443 is a deficient number, since it is larger than the sum of its proper divisors (2610559973).

81262796443 is a wasteful number, since it uses less digits than its factorization.

81262796443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12374.

The product of its digits is 3483648, while the sum is 52.

The spelling of 81262796443 in words is "eighty-one billion, two hundred sixty-two million, seven hundred ninety-six thousand, four hundred forty-three".