16651707779 has 16 divisors (see below), whose sum is σ = 19451136000. Its totient is φ = 14249200392.

The previous prime is 16651707727. The next prime is 16651707799. The reversal of 16651707779 is 97770715661.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-16651707779 is a prime.

It is a super-2 number, since 2×16651707779² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16651707719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168212 + ... + 248190.

It is an arithmetic number, because the mean of its divisors is an integer number (1215696000).

Almost surely, 2^16651707779 is an apocalyptic number.

16651707779 is a deficient number, since it is larger than the sum of its proper divisors (2799428221).

16651707779 is an frugal number, since it uses more digits than its factorization.

16651707779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80607 (or 80593 counting only the distinct ones).

The product of its (nonzero) digits is 3889620, while the sum is 56.

The spelling of 16651707779 in words is "sixteen billion, six hundred fifty-one million, seven hundred seven thousand, seven hundred seventy-nine".