27802123117 has 4 divisors (see below), whose sum is σ = 27803352796. Its totient is φ = 27800893440.

The previous prime is 27802123109. The next prime is 27802123147. The reversal of 27802123117 is 71132120872.

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 17743838436 + 10058284681 = 133206^2 + 100291^2 .

It is a cyclic number.

It is not a de Polignac number, because 27802123117 - 2³ = 27802123109 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 (27802123147) 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, 580278 + ... + 626359.

It is an arithmetic number, because the mean of its divisors is an integer number (6950838199).

Almost surely, 2^27802123117 is an apocalyptic number.

It is an amenable number.

27802123117 is a deficient number, since it is larger than the sum of its proper divisors (1229679).

27802123117 is a wasteful number, since it uses less digits than its factorization.

27802123117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229678.

The product of its (nonzero) digits is 9408, while the sum is 34.

Adding to 27802123117 its reverse (71132120872), we get a palindrome (98934243989).

The spelling of 27802123117 in words is "twenty-seven billion, eight hundred two million, one hundred twenty-three thousand, one hundred seventeen".