16662551 has 2 divisors, whose sum is σ = 16662552. Its totient is φ = 16662550.

The previous prime is 16662517. The next prime is 16662553. The reversal of 16662551 is 15526661.

16662551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16662551 - 2¹⁰ = 16661527 is a prime.

Together with 16662553, 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 (16662553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331275 + 8331276.

It is an arithmetic number, because the mean of its divisors is an integer number (8331276).

Almost surely, 2^16662551 is an apocalyptic number.

16662551 is a deficient number, since it is larger than the sum of its proper divisors (1).

16662551 is an equidigital number, since it uses as much as digits as its factorization.

16662551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 16662551 is about 4081.9788093522. The cubic root of 16662551 is about 255.4154499057.

The spelling of 16662551 in words is "sixteen million, six hundred sixty-two thousand, five hundred fifty-one".