27527499991 has 4 divisors (see below), whose sum is σ = 28976315800. Its totient is φ = 26078684184.

The previous prime is 27527499971. The next prime is 27527499997. The reversal of 27527499991 is 19999472572.

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 27527499991 - 2¹⁹ = 27526975703 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 (27527499997) 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, 724407876 + ... + 724407913.

It is an arithmetic number, because the mean of its divisors is an integer number (7244078950).

Almost surely, 2^27527499991 is an apocalyptic number.

27527499991 is a deficient number, since it is larger than the sum of its proper divisors (1448815809).

27527499991 is a wasteful number, since it uses less digits than its factorization.

27527499991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448815808.

The product of its digits is 25719120, while the sum is 64.

The spelling of 27527499991 in words is "twenty-seven billion, five hundred twenty-seven million, four hundred ninety-nine thousand, nine hundred ninety-one".