2545697641 has 2 divisors, whose sum is σ = 2545697642. Its totient is φ = 2545697640.

The previous prime is 2545697639. The next prime is 2545697677. The reversal of 2545697641 is 1467965452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1389425625 + 1156272016 = 37275^2 + 34004^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545697641 - 2¹ = 2545697639 is a prime.

Together with 2545697639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2545697611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272848820 + 1272848821.

It is an arithmetic number, because the mean of its divisors is an integer number (1272848821).

Almost surely, 2^2545697641 is an apocalyptic number.

It is an amenable number.

2545697641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545697641 is an equidigital number, since it uses as much as digits as its factorization.

2545697641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 49.

The square root of 2545697641 is about 50454.9070061575. The cubic root of 2545697641 is about 1365.4284263911.

The spelling of 2545697641 in words is "two billion, five hundred forty-five million, six hundred ninety-seven thousand, six hundred forty-one".