66624787 has 2 divisors, whose sum is σ = 66624788. Its totient is φ = 66624786.

The previous prime is 66624739. The next prime is 66624793. The reversal of 66624787 is 78742666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66624787 - 2¹⁹ = 66100499 is a prime.

It is not a weakly prime, because it can be changed into another prime (66624707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33312393 + 33312394.

It is an arithmetic number, because the mean of its divisors is an integer number (33312394).

Almost surely, 2^66624787 is an apocalyptic number.

66624787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66624787 is an equidigital number, since it uses as much as digits as its factorization.

66624787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 46.

The square root of 66624787 is about 8162.4008110359. The cubic root of 66624787 is about 405.3952083886.

It can be divided in two parts, 6662 and 4787, that added together give a square (11449 = 107²).

The spelling of 66624787 in words is "sixty-six million, six hundred twenty-four thousand, seven hundred eighty-seven".