81265670093 has 4 divisors (see below), whose sum is σ = 81752291040. Its totient is φ = 80779049148.

The previous prime is 81265670041. The next prime is 81265670111. The reversal of 81265670093 is 39007656218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81265670093 - 2³⁰ = 80191928269 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 (81265670593) 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, 243310223 + ... + 243310556.

It is an arithmetic number, because the mean of its divisors is an integer number (20438072760).

Almost surely, 2^81265670093 is an apocalyptic number.

It is an amenable number.

81265670093 is a deficient number, since it is larger than the sum of its proper divisors (486620947).

81265670093 is a wasteful number, since it uses less digits than its factorization.

81265670093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486620946.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 81265670093 in words is "eighty-one billion, two hundred sixty-five million, six hundred seventy thousand, ninety-three".