244640646621 has 24 divisors (see below), whose sum is σ = 411471066240. Its totient is φ = 137157018336.

The previous prime is 244640646577. The next prime is 244640646623. The reversal of 244640646621 is 126646046442.

It is not a de Polignac number, because 244640646621 - 2¹⁹ = 244640122333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244640646623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36630481 + ... + 36637158.

It is an arithmetic number, because the mean of its divisors is an integer number (17144627760).

Almost surely, 2^244640646621 is an apocalyptic number.

244640646621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

244640646621 is a deficient number, since it is larger than the sum of its proper divisors (166830419619).

244640646621 is a wasteful number, since it uses less digits than its factorization.

244640646621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73267705 (or 73267702 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 45.

The spelling of 244640646621 in words is "two hundred forty-four billion, six hundred forty million, six hundred forty-six thousand, six hundred twenty-one".