16656155692709 has 16 divisors (see below), whose sum is σ = 18999051241968. Its totient is φ = 14465544993792.

The previous prime is 16656155692703. The next prime is 16656155692727. The reversal of 16656155692709 is 90729655165661.

It can be written as a sum of positive squares in 8 ways, for example, as 1627275268609 + 15028880424100 = 1275647^2 + 3876710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16656155692709 is a prime.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16656155692703) 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, 12273962 + ... + 13563275.

It is an arithmetic number, because the mean of its divisors is an integer number (1187440702623).

Almost surely, 2^{16656155692709} is an apocalyptic number.

It is an amenable number.

16656155692709 is a deficient number, since it is larger than the sum of its proper divisors (2342895549259).

16656155692709 is a wasteful number, since it uses less digits than its factorization.

16656155692709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25840184.

The product of its (nonzero) digits is 183708000, while the sum is 68.

The spelling of 16656155692709 in words is "sixteen trillion, six hundred fifty-six billion, one hundred fifty-five million, six hundred ninety-two thousand, seven hundred nine".