27997417577 has 4 divisors (see below), whose sum is σ = 28045113936. Its totient is φ = 27949721220.

The previous prime is 27997417573. The next prime is 27997417601. The reversal of 27997417577 is 77571479972.

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 27997417577 - 2² = 27997417573 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27997417571) 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, 23847299 + ... + 23848472.

It is an arithmetic number, because the mean of its divisors is an integer number (7011278484).

Almost surely, 2^27997417577 is an apocalyptic number.

It is an amenable number.

27997417577 is a deficient number, since it is larger than the sum of its proper divisors (47696359).

27997417577 is an equidigital number, since it uses as much as digits as its factorization.

27997417577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47696358.

The product of its digits is 54454680, while the sum is 65.

The spelling of 27997417577 in words is "twenty-seven billion, nine hundred ninety-seven million, four hundred seventeen thousand, five hundred seventy-seven".