16549903851 has 32 divisors (see below), whose sum is σ = 24812282880. Its totient is φ = 9735817344.

The previous prime is 16549903693. The next prime is 16549903921. The reversal of 16549903851 is 15830994561.

It is not a de Polignac number, because 16549903851 - 2²¹ = 16547806699 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16549903794 and 16549903803.

It is not an unprimeable number, because it can be changed into a prime (16549905851) 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, 1786690 + ... + 1795928.

It is an arithmetic number, because the mean of its divisors is an integer number (775383840).

Almost surely, 2^16549903851 is an apocalyptic number.

16549903851 is a deficient number, since it is larger than the sum of its proper divisors (8262379029).

16549903851 is a wasteful number, since it uses less digits than its factorization.

16549903851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11275.

The product of its (nonzero) digits is 1166400, while the sum is 51.

The spelling of 16549903851 in words is "sixteen billion, five hundred forty-nine million, nine hundred three thousand, eight hundred fifty-one".