66461383 has 2 divisors, whose sum is σ = 66461384. Its totient is φ = 66461382.

The previous prime is 66461371. The next prime is 66461399. The reversal of 66461383 is 38316466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66461383 - 2²¹ = 64364231 is a prime.

It is equal to p_3921868 and since 66461383 and 3921868 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66461683) 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, 33230691 + 33230692.

It is an arithmetic number, because the mean of its divisors is an integer number (33230692).

Almost surely, 2^66461383 is an apocalyptic number.

66461383 is a deficient number, since it is larger than the sum of its proper divisors (1).

66461383 is an equidigital number, since it uses as much as digits as its factorization.

66461383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 37.

The square root of 66461383 is about 8152.3851111193. The cubic root of 66461383 is about 405.0635128762.

The spelling of 66461383 in words is "sixty-six million, four hundred sixty-one thousand, three hundred eighty-three".