2540649775 has 6 divisors (see below), whose sum is σ = 3150405752. Its totient is φ = 2032519800.

The previous prime is 2540649773. The next prime is 2540649781. The reversal of 2540649775 is 5779460452.

It is a happy number.

It is not a de Polignac number, because 2540649775 - 2¹ = 2540649773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540649773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50812971 + ... + 50813020.

Almost surely, 2^2540649775 is an apocalyptic number.

2540649775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2540649775 is a deficient number, since it is larger than the sum of its proper divisors (609755977).

2540649775 is a wasteful number, since it uses less digits than its factorization.

2540649775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101626001 (or 101625996 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The square root of 2540649775 is about 50404.8586447775. The cubic root of 2540649775 is about 1364.5253261488.

The spelling of 2540649775 in words is "two billion, five hundred forty million, six hundred forty-nine thousand, seven hundred seventy-five".