6540263 has 4 divisors (see below), whose sum is σ = 6583728. Its totient is φ = 6496800.

The previous prime is 6540251. The next prime is 6540269. The reversal of 6540263 is 3620456.

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

It is a cyclic number.

It is not a de Polignac number, because 6540263 - 2⁸ = 6540007 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 (6540269) 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, 21506 + ... + 21807.

It is an arithmetic number, because the mean of its divisors is an integer number (1645932).

Almost surely, 2^6540263 is an apocalyptic number.

6540263 is a deficient number, since it is larger than the sum of its proper divisors (43465).

6540263 is a wasteful number, since it uses less digits than its factorization.

6540263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43464.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 6540263 is about 2557.3937905610. The cubic root of 6540263 is about 187.0101036416.

The spelling of 6540263 in words is "six million, five hundred forty thousand, two hundred sixty-three".