11663649 has 16 divisors (see below), whose sum is σ = 18296640. Its totient is φ = 7318080.

The previous prime is 11663647. The next prime is 11663653. The reversal of 11663649 is 94636611.

11663649 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 3 + 649 = 666.

11663649 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11663649 - 2¹ = 11663647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11663647) 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, 12247 + ... + 13164.

It is an arithmetic number, because the mean of its divisors is an integer number (1143540).

Almost surely, 2^11663649 is an apocalyptic number.

It is an amenable number.

11663649 is a deficient number, since it is larger than the sum of its proper divisors (6632991).

11663649 is a wasteful number, since it uses less digits than its factorization.

11663649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25437 (or 25431 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 11663649 is about 3415.2084855833. The cubic root of 11663649 is about 226.7835141008.

The spelling of 11663649 in words is "eleven million, six hundred sixty-three thousand, six hundred forty-nine".