81901011010918 has 32 divisors (see below), whose sum is σ = 143308339764768. Its totient is φ = 34690956096000.

The previous prime is 81901011010849. The next prime is 81901011010943.

81901011010918 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×81901011010918² (a number of 29 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 15 ways as a sum of consecutive naturals, for example, 1084054605 + ... + 1084130152.

It is an arithmetic number, because the mean of its divisors is an integer number (4478385617649).

Almost surely, 2^{81901011010918} is an apocalyptic number.

81901011010918 is a deficient number, since it is larger than the sum of its proper divisors (61407328753850).

81901011010918 is a wasteful number, since it uses less digits than its factorization.

81901011010918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168184888.

The product of its (nonzero) digits is 5184, while the sum is 40.

The spelling of 81901011010918 in words is "eighty-one trillion, nine hundred one billion, eleven million, ten thousand, nine hundred eighteen".