81226497158 has 32 divisors (see below), whose sum is σ = 128263855104. Its totient is φ = 38529987552.

The previous prime is 81226497151. The next prime is 81226497161. The reversal of 81226497158 is 85179462218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81226497151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1846091 + ... + 1889577.

It is an arithmetic number, because the mean of its divisors is an integer number (4008245472).

Almost surely, 2^81226497158 is an apocalyptic number.

81226497158 is a deficient number, since it is larger than the sum of its proper divisors (47037357946).

81226497158 is a wasteful number, since it uses less digits than its factorization.

81226497158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44156.

The product of its digits is 1935360, while the sum is 53.

The spelling of 81226497158 in words is "eighty-one billion, two hundred twenty-six million, four hundred ninety-seven thousand, one hundred fifty-eight".