81373637318 has 16 divisors (see below), whose sum is σ = 123672890880. Its totient is φ = 40149901896.

The previous prime is 81373637287. The next prime is 81373637321.

81373637318 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81373637318² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152405 + ... + 431247.

It is an arithmetic number, because the mean of its divisors is an integer number (7729555680).

Almost surely, 2^81373637318 is an apocalyptic number.

81373637318 is a deficient number, since it is larger than the sum of its proper divisors (42299253562).

81373637318 is a wasteful number, since it uses less digits than its factorization.

81373637318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280771.

The product of its digits is 1524096, while the sum is 50.

The spelling of 81373637318 in words is "eighty-one billion, three hundred seventy-three million, six hundred thirty-seven thousand, three hundred eighteen".