16646640065 has 8 divisors (see below), whose sum is σ = 21791965248. Its totient is φ = 12106647280.

The previous prime is 16646640029. The next prime is 16646640071. The reversal of 16646640065 is 56004664661.

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

It is not a de Polignac number, because 16646640065 - 2¹⁰ = 16646639041 is a prime.

It is a super-2 number, since 2×16646640065² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16646639998 and 16646640025.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151333037 + ... + 151333146.

It is an arithmetic number, because the mean of its divisors is an integer number (2723995656).

Almost surely, 2^16646640065 is an apocalyptic number.

It is an amenable number.

16646640065 is a deficient number, since it is larger than the sum of its proper divisors (5145325183).

16646640065 is a wasteful number, since it uses less digits than its factorization.

16646640065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302666199.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 16646640065 in words is "sixteen billion, six hundred forty-six million, six hundred forty thousand, sixty-five".