66437863 has 2 divisors, whose sum is σ = 66437864. Its totient is φ = 66437862.

The previous prime is 66437849. The next prime is 66437873. The reversal of 66437863 is 36873466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66437863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66437843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33218931 + 33218932.

It is an arithmetic number, because the mean of its divisors is an integer number (33218932).

Almost surely, 2^66437863 is an apocalyptic number.

66437863 is a deficient number, since it is larger than the sum of its proper divisors (1).

66437863 is an equidigital number, since it uses as much as digits as its factorization.

66437863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 43.

The square root of 66437863 is about 8150.9424608446. The cubic root of 66437863 is about 405.0157246346.

It can be divided in two parts, 664378 and 63, that multiplied together give a palindrome (41855814).

The spelling of 66437863 in words is "sixty-six million, four hundred thirty-seven thousand, eight hundred sixty-three".