2505660749 has 4 divisors (see below), whose sum is σ = 2505773664. Its totient is φ = 2505547836.

The previous prime is 2505660743. The next prime is 2505660769. The reversal of 2505660749 is 9470665052.

2505660749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2505660749 - 2¹² = 2505656653 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 (2505660743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10937 + ... + 71630.

It is an arithmetic number, because the mean of its divisors is an integer number (626443416).

Almost surely, 2^2505660749 is an apocalyptic number.

It is an amenable number.

2505660749 is a deficient number, since it is larger than the sum of its proper divisors (112915).

2505660749 is an equidigital number, since it uses as much as digits as its factorization.

2505660749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112914.

The product of its (nonzero) digits is 453600, while the sum is 44.

The square root of 2505660749 is about 50056.5754821482. The cubic root of 2505660749 is about 1358.2324118913.

The spelling of 2505660749 in words is "two billion, five hundred five million, six hundred sixty thousand, seven hundred forty-nine".