189240265261 has 4 divisors (see below), whose sum is σ = 189712186524. Its totient is φ = 188768344000.

The previous prime is 189240265229. The next prime is 189240265271. The reversal of 189240265261 is 162562042981.

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 123713992900 + 65526272361 = 351730^2 + 255981^2 .

It is not a de Polignac number, because 189240265261 - 2⁵ = 189240265229 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 (189240265211) 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, 235960030 + ... + 235960831.

It is an arithmetic number, because the mean of its divisors is an integer number (47428046631).

Almost surely, 2^189240265261 is an apocalyptic number.

It is an amenable number.

189240265261 is a deficient number, since it is larger than the sum of its proper divisors (471921263).

189240265261 is an equidigital number, since it uses as much as digits as its factorization.

189240265261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471921262.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 189240265261 in words is "one hundred eighty-nine billion, two hundred forty million, two hundred sixty-five thousand, two hundred sixty-one".