281066444649 has 81 divisors (see below), whose sum is σ = 437939846877. Its totient is φ = 173679433200.

The previous prime is 281066444639. The next prime is 281066444653. The reversal of 281066444649 is 946444660182.

The square root of 281066444649 is 530157.

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

281066444649 is a `hidden beast` number, since 2 + 81 + 0 + 66 + 44 + 464 + 9 = 666.

It is not a de Polignac number, because 281066444649 - 2⁹ = 281066444137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 281066444595 and 281066444604.

It is not an unprimeable number, because it can be changed into a prime (281066444639) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2145545314 + ... + 2145545444.

Almost surely, 2^281066444649 is an apocalyptic number.

281066444649 is the 530157-th square number.

281066444649 is the 265079-th centered octagonal number.

It is an amenable number.

281066444649 is a deficient number, since it is larger than the sum of its proper divisors (156873402228).

281066444649 is an equidigital number, since it uses as much as digits as its factorization.

281066444649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 281066444649 in words is "two hundred eighty-one billion, sixty-six million, four hundred forty-four thousand, six hundred forty-nine".