27669957491 has 4 divisors (see below), whose sum is σ = 30185408184. Its totient is φ = 25154506800.

The previous prime is 27669957473. The next prime is 27669957517. The reversal of 27669957491 is 19475996672.

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 27669957491 - 2¹⁴ = 27669941107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27669957391) 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, 1257725330 + ... + 1257725351.

It is an arithmetic number, because the mean of its divisors is an integer number (7546352046).

Almost surely, 2^27669957491 is an apocalyptic number.

27669957491 is a deficient number, since it is larger than the sum of its proper divisors (2515450693).

27669957491 is a wasteful number, since it uses less digits than its factorization.

27669957491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515450692.

The product of its digits is 51438240, while the sum is 65.

The spelling of 27669957491 in words is "twenty-seven billion, six hundred sixty-nine million, nine hundred fifty-seven thousand, four hundred ninety-one".