27561947975 has 24 divisors (see below), whose sum is σ = 35009925888. Its totient is φ = 21514917600.

The previous prime is 27561947957. The next prime is 27561947983. The reversal of 27561947975 is 57974916572.

It is not a de Polignac number, because 27561947975 - 2⁶ = 27561947911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 353492 + ... + 424358.

It is an arithmetic number, because the mean of its divisors is an integer number (1458746912).

Almost surely, 2^27561947975 is an apocalyptic number.

27561947975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27561947975 is a deficient number, since it is larger than the sum of its proper divisors (7447977913).

27561947975 is a wasteful number, since it uses less digits than its factorization.

27561947975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71255 (or 71250 counting only the distinct ones).

The product of its digits is 33339600, while the sum is 62.

The spelling of 27561947975 in words is "twenty-seven billion, five hundred sixty-one million, nine hundred forty-seven thousand, nine hundred seventy-five".