27781642475 has 12 divisors (see below), whose sum is σ = 34452623016. Its totient is φ = 22223129280.

The previous prime is 27781642463. The next prime is 27781642481. The reversal of 27781642475 is 57424618772.

It is a happy number.

It is not a de Polignac number, because 27781642475 - 2⁸ = 27781642219 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234884 + ... + 332766.

It is an arithmetic number, because the mean of its divisors is an integer number (2871051918).

Almost surely, 2^27781642475 is an apocalyptic number.

27781642475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27781642475 is a deficient number, since it is larger than the sum of its proper divisors (6670980541).

27781642475 is a wasteful number, since it uses less digits than its factorization.

27781642475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109246 (or 109241 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 53.

The spelling of 27781642475 in words is "twenty-seven billion, seven hundred eighty-one million, six hundred forty-two thousand, four hundred seventy-five".