66455651 has 2 divisors, whose sum is σ = 66455652. Its totient is φ = 66455650.

The previous prime is 66455591. The next prime is 66455659. The reversal of 66455651 is 15655466.

66455651 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 66455651 - 2¹⁴ = 66439267 is a prime.

It is not a weakly prime, because it can be changed into another prime (66455659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33227825 + 33227826.

It is an arithmetic number, because the mean of its divisors is an integer number (33227826).

Almost surely, 2^66455651 is an apocalyptic number.

66455651 is a deficient number, since it is larger than the sum of its proper divisors (1).

66455651 is an equidigital number, since it uses as much as digits as its factorization.

66455651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108000, while the sum is 38.

The square root of 66455651 is about 8152.0335499800. The cubic root of 66455651 is about 405.0518675633.

The spelling of 66455651 in words is "sixty-six million, four hundred fifty-five thousand, six hundred fifty-one".