27666039893 has 4 divisors (see below), whose sum is σ = 27688552140. Its totient is φ = 27643527648.

The previous prime is 27666039883. The next prime is 27666039899. The reversal of 27666039893 is 39893066672.

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 13966039684 + 13700000209 = 118178^2 + 117047^2 .

It is a cyclic number.

It is not a de Polignac number, because 27666039893 - 2¹⁸ = 27665777749 is a prime.

It is a super-2 number, since 2×27666039893² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27666039899) 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, 11254280 + ... + 11256737.

It is an arithmetic number, because the mean of its divisors is an integer number (6922138035).

Almost surely, 2^27666039893 is an apocalyptic number.

It is an amenable number.

27666039893 is a deficient number, since it is larger than the sum of its proper divisors (22512247).

27666039893 is a wasteful number, since it uses less digits than its factorization.

27666039893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22512246.

The product of its (nonzero) digits is 17635968, while the sum is 59.

The spelling of 27666039893 in words is "twenty-seven billion, six hundred sixty-six million, thirty-nine thousand, eight hundred ninety-three".