81242606344 has 16 divisors (see below), whose sum is σ = 156045250620. Its totient is φ = 39630539520.

The previous prime is 81242606327. The next prime is 81242606429. The reversal of 81242606344 is 44360624218.

It can be written as a sum of positive squares in 2 ways, for example, as 50642101444 + 30600504900 = 225038^2 + 174930^2 .

It is a super-2 number, since 2×81242606344² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81242606297 and 81242606306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123845109 + ... + 123845764.

Almost surely, 2^81242606344 is an apocalyptic number.

It is an amenable number.

81242606344 is a deficient number, since it is larger than the sum of its proper divisors (74802644276).

81242606344 is a wasteful number, since it uses less digits than its factorization.

81242606344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247690920 (or 247690916 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 81242606344 in words is "eighty-one billion, two hundred forty-two million, six hundred six thousand, three hundred forty-four".