27646838643 has 16 divisors (see below), whose sum is σ = 37588871936. Its totient is φ = 18069985440.

The previous prime is 27646838633. The next prime is 27646838647. The reversal of 27646838643 is 34683864672.

It is not a de Polignac number, because 27646838643 - 2⁶ = 27646838579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27646838647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189871 + ... + 302232.

It is an arithmetic number, because the mean of its divisors is an integer number (2349304496).

Almost surely, 2^27646838643 is an apocalyptic number.

27646838643 is a deficient number, since it is larger than the sum of its proper divisors (9942033293).

27646838643 is a wasteful number, since it uses less digits than its factorization.

27646838643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492474.

The product of its digits is 27869184, while the sum is 57.

The spelling of 27646838643 in words is "twenty-seven billion, six hundred forty-six million, eight hundred thirty-eight thousand, six hundred forty-three".