27777673561 has 8 divisors (see below), whose sum is σ = 31897807200. Its totient is φ = 23923355040.

The previous prime is 27777673541. The next prime is 27777673579. The reversal of 27777673561 is 16537677772.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27777673561 - 2¹³ = 27777665369 is a prime.

It is a super-2 number, since 2×27777673561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27777673496 and 27777673505.

It is not an unprimeable number, because it can be changed into a prime (27777673531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66453556 + ... + 66453973.

It is an arithmetic number, because the mean of its divisors is an integer number (3987225900).

Almost surely, 2^27777673561 is an apocalyptic number.

It is an amenable number.

27777673561 is a deficient number, since it is larger than the sum of its proper divisors (4120133639).

27777673561 is a wasteful number, since it uses less digits than its factorization.

27777673561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132907559.

The product of its digits is 18151560, while the sum is 58.

The spelling of 27777673561 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred seventy-three thousand, five hundred sixty-one".