1444666681 has 8 divisors (see below), whose sum is σ = 1578991104. Its totient is φ = 1315824960.

The previous prime is 1444666669. The next prime is 1444666703. The reversal of 1444666681 is 1866664441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1444666681 - 2⁵ = 1444666649 is a prime.

It is a super-2 number, since 2×1444666681² = 4174123638383111522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1444666621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370125 + ... + 1371178.

It is an arithmetic number, because the mean of its divisors is an integer number (197373888).

Almost surely, 2^1444666681 is an apocalyptic number.

It is an amenable number.

1444666681 is a deficient number, since it is larger than the sum of its proper divisors (134324423).

1444666681 is a wasteful number, since it uses less digits than its factorization.

1444666681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741351.

The product of its digits is 663552, while the sum is 46.

The square root of 1444666681 is about 38008.7711061539. The cubic root of 1444666681 is about 1130.4617845305.

The spelling of 1444666681 in words is "one billion, four hundred forty-four million, six hundred sixty-six thousand, six hundred eighty-one".