27668575621 has 4 divisors (see below), whose sum is σ = 28312030912. Its totient is φ = 27025120332.

The previous prime is 27668575601. The next prime is 27668575663. The reversal of 27668575621 is 12657586672.

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 a cyclic number.

It is not a de Polignac number, because 27668575621 - 2²⁵ = 27635021189 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 (27668575601) 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, 321727581 + ... + 321727666.

It is an arithmetic number, because the mean of its divisors is an integer number (7078007728).

Almost surely, 2^27668575621 is an apocalyptic number.

It is an amenable number.

27668575621 is a deficient number, since it is larger than the sum of its proper divisors (643455291).

27668575621 is an equidigital number, since it uses as much as digits as its factorization.

27668575621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643455290.

The product of its digits is 8467200, while the sum is 55.

The spelling of 27668575621 in words is "twenty-seven billion, six hundred sixty-eight million, five hundred seventy-five thousand, six hundred twenty-one".