27398365881 has 4 divisors (see below), whose sum is σ = 36531154512. Its totient is φ = 18265577252.

The previous prime is 27398365853. The next prime is 27398365901. The reversal of 27398365881 is 18856389372.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27398365881 is a prime.

It is a super-2 number, since 2×27398365881² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27398365381) 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, 4566394311 + ... + 4566394316.

It is an arithmetic number, because the mean of its divisors is an integer number (9132788628).

Almost surely, 2^27398365881 is an apocalyptic number.

It is an amenable number.

27398365881 is a deficient number, since it is larger than the sum of its proper divisors (9132788631).

27398365881 is an equidigital number, since it uses as much as digits as its factorization.

27398365881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9132788630.

The product of its digits is 17418240, while the sum is 60.

The spelling of 27398365881 in words is "twenty-seven billion, three hundred ninety-eight million, three hundred sixty-five thousand, eight hundred eighty-one".