27777675509 has 4 divisors (see below), whose sum is σ = 27877956204. Its totient is φ = 27677394816.

The previous prime is 27777675473. The next prime is 27777675517. The reversal of 27777675509 is 90557677772.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14633740900 + 13143934609 = 120970^2 + 114647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27777675509 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 (27777695509) 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, 50139932 + ... + 50140485.

It is an arithmetic number, because the mean of its divisors is an integer number (6969489051).

Almost surely, 2^27777675509 is an apocalyptic number.

It is an amenable number.

27777675509 is a deficient number, since it is larger than the sum of its proper divisors (100280695).

27777675509 is a wasteful number, since it uses less digits than its factorization.

27777675509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100280694.

The product of its (nonzero) digits is 45378900, while the sum is 62.

The spelling of 27777675509 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred seventy-five thousand, five hundred nine".