63540643 has 2 divisors, whose sum is σ = 63540644. Its totient is φ = 63540642.

The previous prime is 63540641. The next prime is 63540647. The reversal of 63540643 is 34604536.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63540643 - 2¹ = 63540641 is a prime.

Together with 63540641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63540641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31770321 + 31770322.

It is an arithmetic number, because the mean of its divisors is an integer number (31770322).

Almost surely, 2^63540643 is an apocalyptic number.

63540643 is a deficient number, since it is larger than the sum of its proper divisors (1).

63540643 is an equidigital number, since it uses as much as digits as its factorization.

63540643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 63540643 is about 7971.2384859569. The cubic root of 63540643 is about 399.0407074838.

The spelling of 63540643 in words is "sixty-three million, five hundred forty thousand, six hundred forty-three".