81346545923 has 4 divisors (see below), whose sum is σ = 81348575880. Its totient is φ = 81344515968.

The previous prime is 81346545901. The next prime is 81346545947. The reversal of 81346545923 is 32954564318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81346545923 - 2⁸ = 81346545667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81346545023) 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, 953633 + ... + 1035426.

It is an arithmetic number, because the mean of its divisors is an integer number (20337143970).

Almost surely, 2^81346545923 is an apocalyptic number.

81346545923 is a deficient number, since it is larger than the sum of its proper divisors (2029957).

81346545923 is a wasteful number, since it uses less digits than its factorization.

81346545923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029956.

The product of its digits is 3110400, while the sum is 50.

The spelling of 81346545923 in words is "eighty-one billion, three hundred forty-six million, five hundred forty-five thousand, nine hundred twenty-three".