16551643233 has 8 divisors (see below), whose sum is σ = 22665313408. Its totient is φ = 10736200944.

The previous prime is 16551643219. The next prime is 16551643237. The reversal of 16551643233 is 33234615561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16551643233 - 2⁵ = 16551643201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16551643191 and 16551643200.

It is not an unprimeable number, because it can be changed into a prime (16551643237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74556841 + ... + 74557062.

It is an arithmetic number, because the mean of its divisors is an integer number (2833164176).

Almost surely, 2^16551643233 is an apocalyptic number.

It is an amenable number.

16551643233 is a deficient number, since it is larger than the sum of its proper divisors (6113670175).

16551643233 is a wasteful number, since it uses less digits than its factorization.

16551643233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149113943.

The product of its digits is 194400, while the sum is 39.

The spelling of 16551643233 in words is "sixteen billion, five hundred fifty-one million, six hundred forty-three thousand, two hundred thirty-three".