66476491 has 2 divisors, whose sum is σ = 66476492. Its totient is φ = 66476490.

The previous prime is 66476467. The next prime is 66476507. The reversal of 66476491 is 19467466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66476491 - 2¹³ = 66468299 is a prime.

It is not a weakly prime, because it can be changed into another prime (66476411) 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, 33238245 + 33238246.

It is an arithmetic number, because the mean of its divisors is an integer number (33238246).

Almost surely, 2^66476491 is an apocalyptic number.

66476491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66476491 is an equidigital number, since it uses as much as digits as its factorization.

66476491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 66476491 is about 8153.3116584612. The cubic root of 66476491 is about 405.0942035602.

The spelling of 66476491 in words is "sixty-six million, four hundred seventy-six thousand, four hundred ninety-one".