81007442140367 has 4 divisors (see below), whose sum is σ = 81645296015616. Its totient is φ = 80369588265120.

The previous prime is 81007442140363. The next prime is 81007442140393. The reversal of 81007442140367 is 76304124470018.

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 81007442140367 - 2² = 81007442140363 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 (81007442140363) 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, 318926937434 + ... + 318926937687.

It is an arithmetic number, because the mean of its divisors is an integer number (20411324003904).

Almost surely, 2^{81007442140367} is an apocalyptic number.

81007442140367 is a deficient number, since it is larger than the sum of its proper divisors (637853875249).

81007442140367 is a wasteful number, since it uses less digits than its factorization.

81007442140367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637853875248.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 81007442140367 in words is "eighty-one trillion, seven billion, four hundred forty-two million, one hundred forty thousand, three hundred sixty-seven".