2544663997 has 2 divisors, whose sum is σ = 2544663998. Its totient is φ = 2544663996.

The previous prime is 2544663971. The next prime is 2544664027. The reversal of 2544663997 is 7993664452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2122813476 + 421850521 = 46074^2 + 20539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2544663997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2544663907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272331998 + 1272331999.

It is an arithmetic number, because the mean of its divisors is an integer number (1272331999).

Almost surely, 2^2544663997 is an apocalyptic number.

It is an amenable number.

2544663997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2544663997 is an equidigital number, since it uses as much as digits as its factorization.

2544663997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9797760, while the sum is 55.

The square root of 2544663997 is about 50444.6627206487. The cubic root of 2544663997 is about 1365.2435971662.

The spelling of 2544663997 in words is "two billion, five hundred forty-four million, six hundred sixty-three thousand, nine hundred ninety-seven".