2561490742469 has 2 divisors, whose sum is σ = 2561490742470. Its totient is φ = 2561490742468.

The previous prime is 2561490742403. The next prime is 2561490742553. The reversal of 2561490742469 is 9642470941652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1606082239969 + 955408502500 = 1267313^2 + 977450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561490742469 - 2²⁸ = 2561222307013 is a prime.

It is a super-2 number, since 2×2561490742469² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561490745469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280745371234 + 1280745371235.

It is an arithmetic number, because the mean of its divisors is an integer number (1280745371235).

Almost surely, 2^{2561490742469} is an apocalyptic number.

It is an amenable number.

2561490742469 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561490742469 is an equidigital number, since it uses as much as digits as its factorization.

2561490742469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 2561490742469 in words is "two trillion, five hundred sixty-one billion, four hundred ninety million, seven hundred forty-two thousand, four hundred sixty-nine".