81374247318 has 96 divisors (see below), whose sum is σ = 212007110400. Its totient is φ = 20331762048.

The previous prime is 81374247313. The next prime is 81374247349.

81374247318 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81374247313) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166833 + ... + 436556.

It is an arithmetic number, because the mean of its divisors is an integer number (2208407400).

Almost surely, 2^81374247318 is an apocalyptic number.

81374247318 is an abundant number, since it is smaller than the sum of its proper divisors (130632863082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81374247318 is a wasteful number, since it uses less digits than its factorization.

81374247318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603446 (or 603433 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The spelling of 81374247318 in words is "eighty-one billion, three hundred seventy-four million, two hundred forty-seven thousand, three hundred eighteen".