2505780551 has 2 divisors, whose sum is σ = 2505780552. Its totient is φ = 2505780550.

The previous prime is 2505780521. The next prime is 2505780577. The reversal of 2505780551 is 1550875052.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2505780551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2505780521) 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, 1252890275 + 1252890276.

It is an arithmetic number, because the mean of its divisors is an integer number (1252890276).

Almost surely, 2^2505780551 is an apocalyptic number.

2505780551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505780551 is an equidigital number, since it uses as much as digits as its factorization.

2505780551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70000, while the sum is 38.

The square root of 2505780551 is about 50057.7721338056. The cubic root of 2505780551 is about 1358.2540583926.

The spelling of 2505780551 in words is "two billion, five hundred five million, seven hundred eighty thousand, five hundred fifty-one".