16706723765651 has 16 divisors (see below), whose sum is σ = 17732300004000. Its totient is φ = 15685919735808.

The previous prime is 16706723765603. The next prime is 16706723765671. The reversal of 16706723765651 is 15656732760761.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16706723765651 - 2¹⁸ = 16706723503507 is a prime.

It is a super-2 number, since 2×16706723765651² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16706723765671) 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, 39734360 + ... + 40152618.

It is an arithmetic number, because the mean of its divisors is an integer number (1108268750250).

Almost surely, 2^{16706723765651} is an apocalyptic number.

16706723765651 is a deficient number, since it is larger than the sum of its proper divisors (1025576238349).

16706723765651 is a wasteful number, since it uses less digits than its factorization.

16706723765651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423958.

The product of its (nonzero) digits is 66679200, while the sum is 62.

The spelling of 16706723765651 in words is "sixteen trillion, seven hundred six billion, seven hundred twenty-three million, seven hundred sixty-five thousand, six hundred fifty-one".