27666021983 has 4 divisors (see below), whose sum is σ = 28868892528. Its totient is φ = 26463151440.

The previous prime is 27666021973. The next prime is 27666021991. The reversal of 27666021983 is 38912066672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27666021983 - 2¹⁸ = 27665759839 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 (27666021973) 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, 601435238 + ... + 601435283.

It is an arithmetic number, because the mean of its divisors is an integer number (7217223132).

Almost surely, 2^27666021983 is an apocalyptic number.

27666021983 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

27666021983 is a deficient number, since it is larger than the sum of its proper divisors (1202870545).

27666021983 is a wasteful number, since it uses less digits than its factorization.

27666021983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202870544.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 27666021983 in words is "twenty-seven billion, six hundred sixty-six million, twenty-one thousand, nine hundred eighty-three".