11638252647 has 72 divisors (see below), whose sum is σ = 20611612320. Its totient is φ = 6196383360.

The previous prime is 11638252631. The next prime is 11638252657. The reversal of 11638252647 is 74625283611.

11638252647 is a `hidden beast` number, since 1 + 1 + 6 + 3 + 82 + 526 + 47 = 666.

It is not a de Polignac number, because 11638252647 - 2⁴ = 11638252631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11638252607) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1383129 + ... + 1391517.

Almost surely, 2^11638252647 is an apocalyptic number.

11638252647 is a deficient number, since it is larger than the sum of its proper divisors (8973359673).

11638252647 is a wasteful number, since it uses less digits than its factorization.

11638252647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8501 (or 8479 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 11638252647 in words is "eleven billion, six hundred thirty-eight million, two hundred fifty-two thousand, six hundred forty-seven".