16381807857 has 12 divisors (see below), whose sum is σ = 23947704144. Its totient is φ = 10789623960.

The previous prime is 16381807843. The next prime is 16381807861. The reversal of 16381807857 is 75870818361.

It is a happy number.

It is not a de Polignac number, because 16381807857 - 2¹⁵ = 16381775089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16381807877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10964319 + ... + 10965812.

It is an arithmetic number, because the mean of its divisors is an integer number (1995642012).

Almost surely, 2^16381807857 is an apocalyptic number.

It is an amenable number.

16381807857 is a deficient number, since it is larger than the sum of its proper divisors (7565896287).

16381807857 is a wasteful number, since it uses less digits than its factorization.

16381807857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21930220 (or 21930217 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The spelling of 16381807857 in words is "sixteen billion, three hundred eighty-one million, eight hundred seven thousand, eight hundred fifty-seven".