27747885551 has 4 divisors (see below), whose sum is σ = 29208300600. Its totient is φ = 26287470504.

The previous prime is 27747885523. The next prime is 27747885593. The reversal of 27747885551 is 15558874772.

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 27747885551 - 2²² = 27743691247 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 (27747882551) 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, 730207496 + ... + 730207533.

It is an arithmetic number, because the mean of its divisors is an integer number (7302075150).

Almost surely, 2^27747885551 is an apocalyptic number.

27747885551 is a deficient number, since it is larger than the sum of its proper divisors (1460415049).

27747885551 is a wasteful number, since it uses less digits than its factorization.

27747885551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460415048.

The product of its digits is 21952000, while the sum is 59.

The spelling of 27747885551 in words is "twenty-seven billion, seven hundred forty-seven million, eight hundred eighty-five thousand, five hundred fifty-one".