2161266225133 has 4 divisors (see below), whose sum is σ = 2161275488380. Its totient is φ = 2161256961888.

The previous prime is 2161266225121. The next prime is 2161266225169. The reversal of 2161266225133 is 3315226621612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1680181103524 + 481085121609 = 1296218^2 + 693603^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161266225133 - 2⁵ = 2161266225101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161266225233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4272360 + ... + 4751377.

It is an arithmetic number, because the mean of its divisors is an integer number (540318872095).

Almost surely, 2^{2161266225133} is an apocalyptic number.

It is an amenable number.

2161266225133 is a deficient number, since it is larger than the sum of its proper divisors (9263247).

2161266225133 is an equidigital number, since it uses as much as digits as its factorization.

2161266225133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9263246.

The product of its digits is 155520, while the sum is 40.

The spelling of 2161266225133 in words is "two trillion, one hundred sixty-one billion, two hundred sixty-six million, two hundred twenty-five thousand, one hundred thirty-three".