56821863518 has 8 divisors (see below), whose sum is σ = 97408908912. Its totient is φ = 24352227216.

The previous prime is 56821863491. The next prime is 56821863521. The reversal of 56821863518 is 81536812865.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 56821863518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2029352255 + ... + 2029352282.

It is an arithmetic number, because the mean of its divisors is an integer number (12176113614).

Almost surely, 2^56821863518 is an apocalyptic number.

56821863518 is a deficient number, since it is larger than the sum of its proper divisors (40587045394).

56821863518 is a wasteful number, since it uses less digits than its factorization.

56821863518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4058704546.

The product of its digits is 2764800, while the sum is 53.

The spelling of 56821863518 in words is "fifty-six billion, eight hundred twenty-one million, eight hundred sixty-three thousand, five hundred eighteen".