2546518721 has 2 divisors, whose sum is σ = 2546518722. Its totient is φ = 2546518720.

The previous prime is 2546518679. The next prime is 2546518729. The reversal of 2546518721 is 1278156452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1410828721 + 1135690000 = 37561^2 + 33700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2546518721 - 2¹⁰ = 2546517697 is a prime.

It is not a weakly prime, because it can be changed into another prime (2546518729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1273259360 + 1273259361.

It is an arithmetic number, because the mean of its divisors is an integer number (1273259361).

Almost surely, 2^2546518721 is an apocalyptic number.

It is an amenable number.

2546518721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2546518721 is an equidigital number, since it uses as much as digits as its factorization.

2546518721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 41.

The square root of 2546518721 is about 50463.0431206839. The cubic root of 2546518721 is about 1365.5752107069.

The spelling of 2546518721 in words is "two billion, five hundred forty-six million, five hundred eighteen thousand, seven hundred twenty-one".