2501566849 has 4 divisors (see below), whose sum is σ = 2502637780. Its totient is φ = 2500495920.

The previous prime is 2501566829. The next prime is 2501566913. The reversal of 2501566849 is 9486651052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1814760000 + 686806849 = 42600^2 + 26207^2 .

It is a cyclic number.

It is not a de Polignac number, because 2501566849 - 2¹⁵ = 2501534081 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2501566799 and 2501566808.

It is not an unprimeable number, because it can be changed into a prime (2501566829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531954 + ... + 536635.

It is an arithmetic number, because the mean of its divisors is an integer number (625659445).

Almost surely, 2^2501566849 is an apocalyptic number.

It is an amenable number.

2501566849 is a deficient number, since it is larger than the sum of its proper divisors (1070931).

2501566849 is a wasteful number, since it uses less digits than its factorization.

2501566849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070930.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 2501566849 is about 50015.6660357532. Note that the first 3 decimals coincide. The cubic root of 2501566849 is about 1357.4922879183.

The spelling of 2501566849 in words is "two billion, five hundred one million, five hundred sixty-six thousand, eight hundred forty-nine".