921863783863 has 16 divisors (see below), whose sum is σ = 1059021849600. Its totient is φ = 794266339680.

The previous prime is 921863783849. The next prime is 921863783881. The reversal of 921863783863 is 368387368129.

It is a de Polignac number, because none of the positive numbers 2^k-921863783863 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 921863783795 and 921863783804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921863783263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16686783 + ... + 16741936.

It is an arithmetic number, because the mean of its divisors is an integer number (66188865600).

Almost surely, 2^921863783863 is an apocalyptic number.

921863783863 is a deficient number, since it is larger than the sum of its proper divisors (137158065737).

921863783863 is a wasteful number, since it uses less digits than its factorization.

921863783863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33428862.

The product of its digits is 62705664, while the sum is 64.

It can be divided in two parts, 9218637 and 83863, that added together give a square (9302500 = 3050²).

The spelling of 921863783863 in words is "nine hundred twenty-one billion, eight hundred sixty-three million, seven hundred eighty-three thousand, eight hundred sixty-three".