16646645746 has 8 divisors (see below), whose sum is σ = 24970993884. Its totient is φ = 8322981120.

The previous prime is 16646645713. The next prime is 16646645749. The reversal of 16646645746 is 64754664661.

It can be written as a sum of positive squares in 2 ways, for example, as 14841330625 + 1805315121 = 121825^2 + 42489^2 .

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

It is a super-2 number, since 2×16646645746² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16646645749) 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, 104895 + ... + 210466.

Almost surely, 2^16646645746 is an apocalyptic number.

16646645746 is a deficient number, since it is larger than the sum of its proper divisors (8324348138).

16646645746 is a wasteful number, since it uses less digits than its factorization.

16646645746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341756.

The product of its digits is 17418240, while the sum is 55.

It can be divided in two parts, 166466 and 45746, that added together give a palindrome (212212).

The spelling of 16646645746 in words is "sixteen billion, six hundred forty-six million, six hundred forty-five thousand, seven hundred forty-six".