1440617840621 has 2 divisors, whose sum is σ = 1440617840622. Its totient is φ = 1440617840620.

The previous prime is 1440617840593. The next prime is 1440617840707. The reversal of 1440617840621 is 1260487160441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1073733236521 + 366884604100 = 1036211^2 + 605710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440617840621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440617842621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720308920310 + 720308920311.

It is an arithmetic number, because the mean of its divisors is an integer number (720308920311).

Almost surely, 2^{1440617840621} is an apocalyptic number.

It is an amenable number.

1440617840621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440617840621 is an equidigital number, since it uses as much as digits as its factorization.

1440617840621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 1440617840621 in words is "one trillion, four hundred forty billion, six hundred seventeen million, eight hundred forty thousand, six hundred twenty-one".