27250245816861 has 4 divisors (see below), whose sum is σ = 36333661089152. Its totient is φ = 18166830544572.

The previous prime is 27250245816823. The next prime is 27250245816877. The reversal of 27250245816861 is 16861854205272.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 27250245816861 - 2²⁷ = 27250111599133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27250245836861) 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, 4541707636141 + ... + 4541707636146.

It is an arithmetic number, because the mean of its divisors is an integer number (9083415272288).

Almost surely, 2^{27250245816861} is an apocalyptic number.

It is an amenable number.

27250245816861 is a deficient number, since it is larger than the sum of its proper divisors (9083415272291).

27250245816861 is an equidigital number, since it uses as much as digits as its factorization.

27250245816861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9083415272290.

The product of its (nonzero) digits is 12902400, while the sum is 57.

The spelling of 27250245816861 in words is "twenty-seven trillion, two hundred fifty billion, two hundred forty-five million, eight hundred sixteen thousand, eight hundred sixty-one".