2505649691 has 2 divisors, whose sum is σ = 2505649692. Its totient is φ = 2505649690.

The previous prime is 2505649661. The next prime is 2505649717. The reversal of 2505649691 is 1969465052.

2505649691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2505649691 - 2¹⁰ = 2505648667 is a prime.

It is not a weakly prime, because it can be changed into another prime (2505649621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252824845 + 1252824846.

It is an arithmetic number, because the mean of its divisors is an integer number (1252824846).

Almost surely, 2^2505649691 is an apocalyptic number.

2505649691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505649691 is an equidigital number, since it uses as much as digits as its factorization.

2505649691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 47.

The square root of 2505649691 is about 50056.4650270073. The cubic root of 2505649691 is about 1358.2304138347.

It can be divided in two parts, 25056 and 49691, that added together give a palindrome (74747).

The spelling of 2505649691 in words is "two billion, five hundred five million, six hundred forty-nine thousand, six hundred ninety-one".