81901222210918 has 8 divisors (see below), whose sum is σ = 134020181799720. Its totient is φ = 37227828277680.

The previous prime is 81901222210861. The next prime is 81901222210949.

It is a happy number.

81901222210918 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861391413863 + ... + 1861391413906.

It is an arithmetic number, because the mean of its divisors is an integer number (16752522724965).

Almost surely, 2^{81901222210918} is an apocalyptic number.

81901222210918 is a deficient number, since it is larger than the sum of its proper divisors (52118959588802).

81901222210918 is a wasteful number, since it uses less digits than its factorization.

81901222210918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722782827782.

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 81901222210918 in words is "eighty-one trillion, nine hundred one billion, two hundred twenty-two million, two hundred ten thousand, nine hundred eighteen".