27667661543 has 4 divisors (see below), whose sum is σ = 27941598888. Its totient is φ = 27393724200.

The previous prime is 27667661501. The next prime is 27667661557. The reversal of 27667661543 is 34516676672.

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

It is a cyclic number.

It is not a de Polignac number, because 27667661543 - 2¹² = 27667657447 is a prime.

It is a super-2 number, since 2×27667661543² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27667667543) 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, 136968521 + ... + 136968722.

It is an arithmetic number, because the mean of its divisors is an integer number (6985399722).

Almost surely, 2^27667661543 is an apocalyptic number.

27667661543 is a deficient number, since it is larger than the sum of its proper divisors (273937345).

27667661543 is a wasteful number, since it uses less digits than its factorization.

27667661543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273937344.

The product of its digits is 7620480, while the sum is 53.

The spelling of 27667661543 in words is "twenty-seven billion, six hundred sixty-seven million, six hundred sixty-one thousand, five hundred forty-three".