144247664781 has 24 divisors (see below), whose sum is σ = 234893662080. Its totient is φ = 87422825160.

The previous prime is 144247664779. The next prime is 144247664833. The reversal of 144247664781 is 187466742441.

144247664781 is a `hidden beast` number, since 1 + 4 + 42 + 476 + 64 + 78 + 1 = 666.

It is not a de Polignac number, because 144247664781 - 2¹ = 144247664779 is a prime.

It is a super-2 number, since 2×144247664781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144247665781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22073205 + ... + 22079738.

It is an arithmetic number, because the mean of its divisors is an integer number (9787235920).

Almost surely, 2^144247664781 is an apocalyptic number.

144247664781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

144247664781 is a deficient number, since it is larger than the sum of its proper divisors (90645997299).

144247664781 is a wasteful number, since it uses less digits than its factorization.

144247664781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44152974 (or 44152957 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 54.

The spelling of 144247664781 in words is "one hundred forty-four billion, two hundred forty-seven million, six hundred sixty-four thousand, seven hundred eighty-one".