2191826457245 has 4 divisors (see below), whose sum is σ = 2630191748700. Its totient is φ = 1753461165792.

The previous prime is 2191826457187. The next prime is 2191826457259. The reversal of 2191826457245 is 5427546281912.

It is a happy number.

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 768534508921 + 1423291948324 = 876661^2 + 1193018^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191826457245 - 2⁶ = 2191826457181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219182645720 + ... + 219182645729.

It is an arithmetic number, because the mean of its divisors is an integer number (657547937175).

Almost surely, 2^{2191826457245} is an apocalyptic number.

It is an amenable number.

2191826457245 is a deficient number, since it is larger than the sum of its proper divisors (438365291455).

2191826457245 is an equidigital number, since it uses as much as digits as its factorization.

2191826457245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438365291454.

The product of its digits is 9676800, while the sum is 56.

The spelling of 2191826457245 in words is "two trillion, one hundred ninety-one billion, eight hundred twenty-six million, four hundred fifty-seven thousand, two hundred forty-five".