56821982839 has 4 divisors (see below), whose sum is σ = 59292503856. Its totient is φ = 54351461824.

The previous prime is 56821982831. The next prime is 56821982891. The reversal of 56821982839 is 93828912865.

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 56821982839 - 2³ = 56821982831 is a prime.

It is a super-2 number, since 2×56821982839² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56821982831) 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, 1235260474 + ... + 1235260519.

It is an arithmetic number, because the mean of its divisors is an integer number (14823125964).

Almost surely, 2^56821982839 is an apocalyptic number.

56821982839 is a deficient number, since it is larger than the sum of its proper divisors (2470521017).

56821982839 is a wasteful number, since it uses less digits than its factorization.

56821982839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470521016.

The product of its digits is 14929920, while the sum is 61.

The spelling of 56821982839 in words is "fifty-six billion, eight hundred twenty-one million, nine hundred eighty-two thousand, eight hundred thirty-nine".