6363959891 has 4 divisors (see below), whose sum is σ = 6368852784. Its totient is φ = 6359067000.

The previous prime is 6363959887. The next prime is 6363959923. The reversal of 6363959891 is 1989593636.

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 6363959891 - 2² = 6363959887 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 6363959891.

It is not an unprimeable number, because it can be changed into a prime (6363959831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2444495 + ... + 2447096.

It is an arithmetic number, because the mean of its divisors is an integer number (1592213196).

Almost surely, 2^6363959891 is an apocalyptic number.

6363959891 is a deficient number, since it is larger than the sum of its proper divisors (4892893).

6363959891 is a wasteful number, since it uses less digits than its factorization.

6363959891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4892892.

The product of its digits is 9447840, while the sum is 59.

The square root of 6363959891 is about 79774.4313110410. The cubic root of 6363959891 is about 1853.1439009590.

The spelling of 6363959891 in words is "six billion, three hundred sixty-three million, nine hundred fifty-nine thousand, eight hundred ninety-one".