2540349853257 has 4 divisors (see below), whose sum is σ = 3387133137680. Its totient is φ = 1693566568836.

The previous prime is 2540349853189. The next prime is 2540349853273. The reversal of 2540349853257 is 7523589430452.

2540349853257 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.

It is not a de Polignac number, because 2540349853257 - 2⁸ = 2540349853001 is a prime.

It is a super-2 number, since 2×2540349853257² (a number of 26 digits) contains 22 as substring.

It is the 1593848-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2540349853197 and 2540349853206.

It is not an unprimeable number, because it can be changed into a prime (2540349855257) by changing a digit.

It is a nontrivial repunit in base 1593847.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423391642207 + ... + 423391642212.

It is an arithmetic number, because the mean of its divisors is an integer number (846783284420).

Almost surely, 2^{2540349853257} is an apocalyptic number.

It is an amenable number.

2540349853257 is a deficient number, since it is larger than the sum of its proper divisors (846783284423).

2540349853257 is an equidigital number, since it uses as much as digits as its factorization.

2540349853257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846783284422.

The product of its (nonzero) digits is 36288000, while the sum is 57.

The spelling of 2540349853257 in words is "two trillion, five hundred forty billion, three hundred forty-nine million, eight hundred fifty-three thousand, two hundred fifty-seven".