16220857851 has 32 divisors (see below), whose sum is σ = 26299434240. Its totient is φ = 9799358400.

The previous prime is 16220857843. The next prime is 16220857889. The reversal of 16220857851 is 15875802261.

16220857851 is a `hidden beast` number, since 1 + 6 + 2 + 20 + 8 + 578 + 51 = 666.

It is not a de Polignac number, because 16220857851 - 2³ = 16220857843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16220857797 and 16220857806.

It is not an unprimeable number, because it can be changed into a prime (16220855851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5716 + ... + 180206.

It is an arithmetic number, because the mean of its divisors is an integer number (821857320).

Almost surely, 2^16220857851 is an apocalyptic number.

16220857851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16220857851 is a deficient number, since it is larger than the sum of its proper divisors (10078576389).

16220857851 is a wasteful number, since it uses less digits than its factorization.

16220857851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174824 (or 174818 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 16220857851 in words is "sixteen billion, two hundred twenty million, eight hundred fifty-seven thousand, eight hundred fifty-one".