81383638318 has 8 divisors (see below), whose sum is σ = 122080245120. Its totient is φ = 40690223280.

The previous prime is 81383638309. The next prime is 81383638319.

81383638318 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81383638319) 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, 733143 + ... + 836818.

It is an arithmetic number, because the mean of its divisors is an integer number (15260030640).

Almost surely, 2^81383638318 is an apocalyptic number.

81383638318 is a deficient number, since it is larger than the sum of its proper divisors (40696606802).

81383638318 is a wasteful number, since it uses less digits than its factorization.

81383638318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595882.

The product of its digits is 1990656, while the sum is 52.

The spelling of 81383638318 in words is "eighty-one billion, three hundred eighty-three million, six hundred thirty-eight thousand, three hundred eighteen".