27636639401 has 12 divisors (see below), whose sum is σ = 32158506240. Its totient is φ = 23681354760.

The previous prime is 27636639389. The next prime is 27636639409. The reversal of 27636639401 is 10493663672.

It is not a de Polignac number, because 27636639401 - 2⁶ = 27636639337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27636639409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80636 + ... + 248546.

It is an arithmetic number, because the mean of its divisors is an integer number (2679875520).

Almost surely, 2^27636639401 is an apocalyptic number.

It is an amenable number.

27636639401 is a deficient number, since it is larger than the sum of its proper divisors (4521866839).

27636639401 is a wasteful number, since it uses less digits than its factorization.

27636639401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171284 (or 171277 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 27636639401 in words is "twenty-seven billion, six hundred thirty-six million, six hundred thirty-nine thousand, four hundred one".