2544655021 has 2 divisors, whose sum is σ = 2544655022. Its totient is φ = 2544655020.

The previous prime is 2544654997. The next prime is 2544655063. The reversal of 2544655021 is 1205564452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1280852521 + 1263802500 = 35789^2 + 35550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2544655021 - 2¹³ = 2544646829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2544655121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272327510 + 1272327511.

It is an arithmetic number, because the mean of its divisors is an integer number (1272327511).

Almost surely, 2^2544655021 is an apocalyptic number.

It is an amenable number.

2544655021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2544655021 is an equidigital number, since it uses as much as digits as its factorization.

2544655021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 34.

The square root of 2544655021 is about 50444.5737517922. The cubic root of 2544655021 is about 1365.2419919194.

The spelling of 2544655021 in words is "two billion, five hundred forty-four million, six hundred fifty-five thousand, twenty-one".