2546649891 has 12 divisors (see below), whose sum is σ = 3691588680. Its totient is φ = 1691723040.

The previous prime is 2546649887. The next prime is 2546649893. The reversal of 2546649891 is 1989466452.

2546649891 is a `hidden beast` number, since 2 + 5 + 4 + 66 + 498 + 91 = 666.

It is not a de Polignac number, because 2546649891 - 2² = 2546649887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2546649893) 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 in 11 ways as a sum of consecutive naturals, for example, 500961 + ... + 506018.

It is an arithmetic number, because the mean of its divisors is an integer number (307632390).

Almost surely, 2^2546649891 is an apocalyptic number.

2546649891 is a deficient number, since it is larger than the sum of its proper divisors (1144938789).

2546649891 is a wasteful number, since it uses less digits than its factorization.

2546649891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007266 (or 1007263 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 2546649891 is about 50464.3427679386. The cubic root of 2546649891 is about 1365.5986570199.

It can be divided in two parts, 25466 and 49891, that added together give a palindrome (75357).

The spelling of 2546649891 in words is "two billion, five hundred forty-six million, six hundred forty-nine thousand, eight hundred ninety-one".