16651556323 has 4 divisors (see below), whose sum is σ = 16656570648. Its totient is φ = 16646542000.

The previous prime is 16651556269. The next prime is 16651556387. The reversal of 16651556323 is 32365515661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16651556323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16651556323.

It is not an unprimeable number, because it can be changed into a prime (16651550323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2502178 + ... + 2508823.

It is an arithmetic number, because the mean of its divisors is an integer number (4164142662).

Almost surely, 2^16651556323 is an apocalyptic number.

16651556323 is a deficient number, since it is larger than the sum of its proper divisors (5014325).

16651556323 is an equidigital number, since it uses as much as digits as its factorization.

16651556323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5014324.

The product of its digits is 486000, while the sum is 43.

The spelling of 16651556323 in words is "sixteen billion, six hundred fifty-one million, five hundred fifty-six thousand, three hundred twenty-three".