81126216190 has 32 divisors (see below), whose sum is σ = 148113231840. Its totient is φ = 31987436544.

The previous prime is 81126216187. The next prime is 81126216203. The reversal of 81126216190 is 9161262118.

It is a super-2 number, since 2×81126216190² (a number of 23 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, 1265941 + ... + 1328479.

It is an arithmetic number, because the mean of its divisors is an integer number (4628538495).

Almost surely, 2^81126216190 is an apocalyptic number.

81126216190 is a deficient number, since it is larger than the sum of its proper divisors (66987015650).

81126216190 is a wasteful number, since it uses less digits than its factorization.

81126216190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64396.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 81126216190 in words is "eighty-one billion, one hundred twenty-six million, two hundred sixteen thousand, one hundred ninety".