2165355606261 has 8 divisors (see below), whose sum is σ = 2936075398560. Its totient is φ = 1419103109072.

The previous prime is 2165355606223. The next prime is 2165355606283. The reversal of 2165355606261 is 1626065535612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165355606261 - 2²³ = 2165347217653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165355606261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165355602261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6116823570 + ... + 6116823923.

It is an arithmetic number, because the mean of its divisors is an integer number (367009424820).

Almost surely, 2^{2165355606261} is an apocalyptic number.

It is an amenable number.

2165355606261 is a deficient number, since it is larger than the sum of its proper divisors (770719792299).

2165355606261 is a wasteful number, since it uses less digits than its factorization.

2165355606261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12233647555.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 2165355606261 in words is "two trillion, one hundred sixty-five billion, three hundred fifty-five million, six hundred six thousand, two hundred sixty-one".