16778472223 has 4 divisors (see below), whose sum is σ = 16781425128. Its totient is φ = 16775519320.

The previous prime is 16778472211. The next prime is 16778472229. The reversal of 16778472223 is 32227487761.

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-16778472223 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16778472229) 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, 1467913 + ... + 1479298.

It is an arithmetic number, because the mean of its divisors is an integer number (4195356282).

Almost surely, 2^16778472223 is an apocalyptic number.

16778472223 is a deficient number, since it is larger than the sum of its proper divisors (2952905).

16778472223 is an equidigital number, since it uses as much as digits as its factorization.

16778472223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952904.

The product of its digits is 1580544, while the sum is 49.

The spelling of 16778472223 in words is "sixteen billion, seven hundred seventy-eight million, four hundred seventy-two thousand, two hundred twenty-three".