27677667761 has 4 divisors (see below), whose sum is σ = 27711380724. Its totient is φ = 27643954800.

The previous prime is 27677667737. The next prime is 27677667779. The reversal of 27677667761 is 16776677672.

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 4159605025 + 23518062736 = 64495^2 + 153356^2 .

It is a cyclic number.

It is not a de Polignac number, because 27677667761 - 2¹⁸ = 27677405617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27677667694 and 27677667703.

It is not an unprimeable number, because it can be changed into a prime (27677667161) 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, 16855250 + ... + 16856891.

It is an arithmetic number, because the mean of its divisors is an integer number (6927845181).

Almost surely, 2^27677667761 is an apocalyptic number.

It is an amenable number.

27677667761 is a deficient number, since it is larger than the sum of its proper divisors (33712963).

27677667761 is an equidigital number, since it uses as much as digits as its factorization.

27677667761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33712962.

The product of its digits is 43563744, while the sum is 62.

The spelling of 27677667761 in words is "twenty-seven billion, six hundred seventy-seven million, six hundred sixty-seven thousand, seven hundred sixty-one".