7863643663 has 4 divisors (see below), whose sum is σ = 7863870960. Its totient is φ = 7863416368.

The previous prime is 7863643643. The next prime is 7863643691. The reversal of 7863643663 is 3663463687.

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 7863643663 - 2⁵ = 7863643631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7863643663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7863643643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49795 + ... + 134932.

It is an arithmetic number, because the mean of its divisors is an integer number (1965967740).

Almost surely, 2^7863643663 is an apocalyptic number.

7863643663 is a deficient number, since it is larger than the sum of its proper divisors (227297).

7863643663 is a wasteful number, since it uses less digits than its factorization.

7863643663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227296.

The product of its digits is 7838208, while the sum is 52.

The square root of 7863643663 is about 88677.1879515809. The cubic root of 7863643663 is about 1988.5717943552.

The spelling of 7863643663 in words is "seven billion, eight hundred sixty-three million, six hundred forty-three thousand, six hundred sixty-three".