81240373320269 has 4 divisors (see below), whose sum is σ = 81251075524320. Its totient is φ = 81229671116220.

The previous prime is 81240373320241. The next prime is 81240373320329. The reversal of 81240373320269 is 96202337304218.

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 81240373320269 - 2¹² = 81240373316173 is a prime.

It is a super-2 number, since 2×81240373320269² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81240373320569) 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, 5351090639 + ... + 5351105820.

It is an arithmetic number, because the mean of its divisors is an integer number (20312768881080).

Almost surely, 2^{81240373320269} is an apocalyptic number.

It is an amenable number.

81240373320269 is a deficient number, since it is larger than the sum of its proper divisors (10702204051).

81240373320269 is a wasteful number, since it uses less digits than its factorization.

81240373320269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10702204050.

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 81240373320269 in words is "eighty-one trillion, two hundred forty billion, three hundred seventy-three million, three hundred twenty thousand, two hundred sixty-nine".