27909816331 has 4 divisors (see below), whose sum is σ = 27913269664. Its totient is φ = 27906363000.

The previous prime is 27909816329. The next prime is 27909816343. The reversal of 27909816331 is 13361890972.

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 27909816331 - 2¹ = 27909816329 is a prime.

It is a super-2 number, since 2×27909816331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27909816631) 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, 1714515 + ... + 1730716.

It is an arithmetic number, because the mean of its divisors is an integer number (6978317416).

Almost surely, 2^27909816331 is an apocalyptic number.

27909816331 is a deficient number, since it is larger than the sum of its proper divisors (3453333).

27909816331 is an equidigital number, since it uses as much as digits as its factorization.

27909816331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453332.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 27909816331 in words is "twenty-seven billion, nine hundred nine million, eight hundred sixteen thousand, three hundred thirty-one".