81376267318 has 32 divisors (see below), whose sum is σ = 132009765984. Its totient is φ = 37482711552.

The previous prime is 81376267289. The next prime is 81376267337.

81376267318 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81376267318² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243880 + ... + 471412.

It is an arithmetic number, because the mean of its divisors is an integer number (4125305187).

Almost surely, 2^81376267318 is an apocalyptic number.

81376267318 is a deficient number, since it is larger than the sum of its proper divisors (50633498666).

81376267318 is a wasteful number, since it uses less digits than its factorization.

81376267318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227776.

The product of its digits is 2032128, while the sum is 52.

The spelling of 81376267318 in words is "eighty-one billion, three hundred seventy-six million, two hundred sixty-seven thousand, three hundred eighteen".