56821284863999 has 4 divisors (see below), whose sum is σ = 56821626076320. Its totient is φ = 56820943651680.

The previous prime is 56821284863909. The next prime is 56821284864037. The reversal of 56821284863999 is 99936848212865.

It is a happy number.

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 56821284863999 - 2²⁸ = 56821016428543 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 (56821284863909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (37) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170356247 + ... + 170689464.

It is an arithmetic number, because the mean of its divisors is an integer number (14205406519080).

Almost surely, 2^{56821284863999} is an apocalyptic number.

56821284863999 is a deficient number, since it is larger than the sum of its proper divisors (341212321).

56821284863999 is a wasteful number, since it uses less digits than its factorization.

56821284863999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341212320.

The product of its digits is 3224862720, while the sum is 80.

The spelling of 56821284863999 in words is "fifty-six trillion, eight hundred twenty-one billion, two hundred eighty-four million, eight hundred sixty-three thousand, nine hundred ninety-nine".