16039661644 has 6 divisors (see below), whose sum is σ = 28069407884. Its totient is φ = 8019830820.

The previous prime is 16039661621. The next prime is 16039661647. The reversal of 16039661644 is 44616693061.

It is a junction number, because it is equal to n+sod(n) for n = 16039661594 and 16039661603.

It is not an unprimeable number, because it can be changed into a prime (16039661647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2004957702 + ... + 2004957709.

Almost surely, 2^16039661644 is an apocalyptic number.

It is an amenable number.

16039661644 is a deficient number, since it is larger than the sum of its proper divisors (12029746240).

16039661644 is a wasteful number, since it uses less digits than its factorization.

16039661644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4009915415 (or 4009915413 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 16039661644 in words is "sixteen billion, thirty-nine million, six hundred sixty-one thousand, six hundred forty-four".