16645432077 has 18 divisors (see below), whose sum is σ = 24228565166. Its totient is φ = 11012142960.

The previous prime is 16645432061. The next prime is 16645432079. The reversal of 16645432077 is 77023454661.

16645432077 is a `hidden beast` number, since 16 + 6 + 4 + 543 + 20 + 77 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10280743236 + 6364688841 = 101394^2 + 79779^2 .

It is not a de Polignac number, because 16645432077 - 2⁴ = 16645432061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645432079) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 100563 + ... + 208335.

Almost surely, 2^16645432077 is an apocalyptic number.

It is an amenable number.

16645432077 is a deficient number, since it is larger than the sum of its proper divisors (7583133089).

16645432077 is a wasteful number, since it uses less digits than its factorization.

16645432077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108041 (or 107907 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 16645432077 in words is "sixteen billion, six hundred forty-five million, four hundred thirty-two thousand, seventy-seven".