16780335218 has 4 divisors (see below), whose sum is σ = 25170502830. Its totient is φ = 8390167608.

The previous prime is 16780335191. The next prime is 16780335251. The reversal of 16780335218 is 81253308761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81253308761 = 88819 ⋅914819.

It can be written as a sum of positive squares in only one way, i.e., 16697033089 + 83302129 = 129217^2 + 9127^2 .

It is a super-2 number, since 2×16780335218² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4195083803 + ... + 4195083806.

Almost surely, 2^16780335218 is an apocalyptic number.

16780335218 is a deficient number, since it is larger than the sum of its proper divisors (8390167612).

16780335218 is an equidigital number, since it uses as much as digits as its factorization.

16780335218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8390167611.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 16780335218 in words is "sixteen billion, seven hundred eighty million, three hundred thirty-five thousand, two hundred eighteen".