81246661444 has 81 divisors (see below), whose sum is σ = 162771759927. Its totient is φ = 35463287808.

The previous prime is 81246661439. The next prime is 81246661459. The reversal of 81246661444 is 44416664218.

The square root of 81246661444 is 285038.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7632119044 + 73614542400 = 87362^2 + 271320^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81246661394 and 81246661403.

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 26 ways as a sum of consecutive naturals, for example, 140808484 + ... + 140809060.

Almost surely, 2^81246661444 is an apocalyptic number.

81246661444 is the 285038-th square number.

It is an amenable number.

81246661444 is an abundant number, since it is smaller than the sum of its proper divisors (81525098483).

81246661444 is a wasteful number, since it uses less digits than its factorization.

81246661444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 611 counting only the distinct ones).

The product of its digits is 884736, while the sum is 46.

The spelling of 81246661444 in words is "eighty-one billion, two hundred forty-six million, six hundred sixty-one thousand, four hundred forty-four".