11663551 has 8 divisors (see below), whose sum is σ = 11936160. Its totient is φ = 11392992.

The previous prime is 11663543. The next prime is 11663563. The reversal of 11663551 is 15536611.

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

It is a cyclic number.

It is not a de Polignac number, because 11663551 - 2³ = 11663543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18721 + ... + 19333.

It is an arithmetic number, because the mean of its divisors is an integer number (1492020).

Almost surely, 2^11663551 is an apocalyptic number.

11663551 is a deficient number, since it is larger than the sum of its proper divisors (272609).

11663551 is an equidigital number, since it uses as much as digits as its factorization.

11663551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025.

The product of its digits is 2700, while the sum is 28.

The square root of 11663551 is about 3415.1941379664. The cubic root of 11663551 is about 226.7828789409.

The spelling of 11663551 in words is "eleven million, six hundred sixty-three thousand, five hundred fifty-one".