11664551 has 2 divisors, whose sum is σ = 11664552. Its totient is φ = 11664550.

The previous prime is 11664547. The next prime is 11664553. The reversal of 11664551 is 15546611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11664551 - 2² = 11664547 is a prime.

Together with 11664553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11664553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5832275 + 5832276.

It is an arithmetic number, because the mean of its divisors is an integer number (5832276).

Almost surely, 2^11664551 is an apocalyptic number.

11664551 is a deficient number, since it is larger than the sum of its proper divisors (1).

11664551 is an equidigital number, since it uses as much as digits as its factorization.

11664551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 11664551 is about 3415.3405393899. The cubic root of 11664551 is about 226.7893599974.

The spelling of 11664551 in words is "eleven million, six hundred sixty-four thousand, five hundred fifty-one".