81510617222 has 8 divisors (see below), whose sum is σ = 124572830256. Its totient is φ = 39986340472.

The previous prime is 81510617203. The next prime is 81510617239. The reversal of 81510617222 is 22271601518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81510617222² (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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384483938 + ... + 384484149.

It is an arithmetic number, because the mean of its divisors is an integer number (15571603782).

Almost surely, 2^81510617222 is an apocalyptic number.

81510617222 is a deficient number, since it is larger than the sum of its proper divisors (43062213034).

81510617222 is a wasteful number, since it uses less digits than its factorization.

81510617222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768968142.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 81510617222 in words is "eighty-one billion, five hundred ten million, six hundred seventeen thousand, two hundred twenty-two".