2540718649 has 16 divisors (see below), whose sum is σ = 2965552000. Its totient is φ = 2175837552.

The previous prime is 2540718643. The next prime is 2540718659. The reversal of 2540718649 is 9468170452.

It is a de Polignac number, because none of the positive numbers 2^k-2540718649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2540718599 and 2540718608.

It is not an unprimeable number, because it can be changed into a prime (2540718643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497899 + ... + 502975.

It is an arithmetic number, because the mean of its divisors is an integer number (185347000).

Almost surely, 2^2540718649 is an apocalyptic number.

It is an amenable number.

2540718649 is a deficient number, since it is larger than the sum of its proper divisors (424833351).

2540718649 is an equidigital number, since it uses as much as digits as its factorization.

2540718649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6557 (or 6543 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 2540718649 is about 50405.5418480944. The cubic root of 2540718649 is about 1364.5376562581.

The spelling of 2540718649 in words is "two billion, five hundred forty million, seven hundred eighteen thousand, six hundred forty-nine".