66887551 has 2 divisors, whose sum is σ = 66887552. Its totient is φ = 66887550.

The previous prime is 66887531. The next prime is 66887563. The reversal of 66887551 is 15578866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66887551 - 2¹³ = 66879359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66887501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33443775 + 33443776.

It is an arithmetic number, because the mean of its divisors is an integer number (33443776).

Almost surely, 2^66887551 is an apocalyptic number.

66887551 is a deficient number, since it is larger than the sum of its proper divisors (1).

66887551 is an equidigital number, since it uses as much as digits as its factorization.

66887551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 46.

The square root of 66887551 is about 8178.4809714274. The cubic root of 66887551 is about 405.9274604077.

The spelling of 66887551 in words is "sixty-six million, eight hundred eighty-seven thousand, five hundred fifty-one".