16553863863 has 16 divisors (see below), whose sum is σ = 24711456000. Its totient is φ = 10951663320.

The previous prime is 16553863813. The next prime is 16553863871. The reversal of 16553863863 is 36836835561.

16553863863 is a `hidden beast` number, since 1 + 6 + 553 + 8 + 6 + 3 + 86 + 3 = 666.

It is not a de Polignac number, because 16553863863 - 2¹² = 16553859767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16553863813) 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, 2336563 + ... + 2343636.

It is an arithmetic number, because the mean of its divisors is an integer number (1544466000).

Almost surely, 2^16553863863 is an apocalyptic number.

16553863863 is a deficient number, since it is larger than the sum of its proper divisors (8157592137).

16553863863 is a wasteful number, since it uses less digits than its factorization.

16553863863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680339 (or 4680333 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 16553863863 in words is "sixteen billion, five hundred fifty-three million, eight hundred sixty-three thousand, eight hundred sixty-three".