2161666272359 has 16 divisors (see below), whose sum is σ = 2370212596224. Its totient is φ = 1955144503200.

The previous prime is 2161666272347. The next prime is 2161666272377. The reversal of 2161666272359 is 9532726661612.

It is a cyclic number.

It is not a de Polignac number, because 2161666272359 - 2³⁶ = 2092946795623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161666212359) 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, 1752974 + ... + 2719604.

It is an arithmetic number, because the mean of its divisors is an integer number (148138287264).

Almost surely, 2^{2161666272359} is an apocalyptic number.

2161666272359 is a deficient number, since it is larger than the sum of its proper divisors (208546323865).

2161666272359 is a wasteful number, since it uses less digits than its factorization.

2161666272359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967678.

The product of its digits is 9797760, while the sum is 56.

The spelling of 2161666272359 in words is "two trillion, one hundred sixty-one billion, six hundred sixty-six million, two hundred seventy-two thousand, three hundred fifty-nine".