27781651606 has 8 divisors (see below), whose sum is σ = 41761713240. Its totient is φ = 13861080528.

The previous prime is 27781651589. The next prime is 27781651607. The reversal of 27781651606 is 60615618772.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 27781651606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27781651607) 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, 14871471 + ... + 14873338.

It is an arithmetic number, because the mean of its divisors is an integer number (5220214155).

Almost surely, 2^27781651606 is an apocalyptic number.

27781651606 is a deficient number, since it is larger than the sum of its proper divisors (13980061634).

27781651606 is a wasteful number, since it uses less digits than its factorization.

27781651606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29745278.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 27781651606 in words is "twenty-seven billion, seven hundred eighty-one million, six hundred fifty-one thousand, six hundred six".