27786115551 has 16 divisors (see below), whose sum is σ = 37703543168. Its totient is φ = 18197157600.

The previous prime is 27786115547. The next prime is 27786115597. The reversal of 27786115551 is 15551168772.

It is a happy number.

It is not a de Polignac number, because 27786115551 - 2² = 27786115547 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27786115551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27786115501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47556 + ... + 240486.

It is an arithmetic number, because the mean of its divisors is an integer number (2356471448).

Almost surely, 2^27786115551 is an apocalyptic number.

27786115551 is a deficient number, since it is larger than the sum of its proper divisors (9917427617).

27786115551 is a wasteful number, since it uses less digits than its factorization.

27786115551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193782.

The product of its digits is 588000, while the sum is 48.

The spelling of 27786115551 in words is "twenty-seven billion, seven hundred eighty-six million, one hundred fifteen thousand, five hundred fifty-one".