81268187108386 has 16 divisors (see below), whose sum is σ = 122115428910144. Its totient is φ = 40563096752304.

The previous prime is 81268187108377. The next prime is 81268187108419. The reversal of 81268187108386 is 68380178186218.

It is a super-2 number, since 2×81268187108386² (a number of 29 digits) contains 22 as substring.

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, 10062600 + ... + 16241683.

It is an arithmetic number, because the mean of its divisors is an integer number (7632214306884).

Almost surely, 2^{81268187108386} is an apocalyptic number.

81268187108386 is a deficient number, since it is larger than the sum of its proper divisors (40847241801758).

81268187108386 is a wasteful number, since it uses less digits than its factorization.

81268187108386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26306985.

The product of its (nonzero) digits is 49545216, while the sum is 67.

The spelling of 81268187108386 in words is "eighty-one trillion, two hundred sixty-eight billion, one hundred eighty-seven million, one hundred eight thousand, three hundred eighty-six".