66920563 has 2 divisors, whose sum is σ = 66920564. Its totient is φ = 66920562.

The previous prime is 66920561. The next prime is 66920617. The reversal of 66920563 is 36502966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66920563 - 2¹ = 66920561 is a prime.

Together with 66920561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66920561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33460281 + 33460282.

It is an arithmetic number, because the mean of its divisors is an integer number (33460282).

Almost surely, 2^66920563 is an apocalyptic number.

66920563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66920563 is an equidigital number, since it uses as much as digits as its factorization.

66920563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 66920563 is about 8180.4989456634. The cubic root of 66920563 is about 405.9942305472.

The spelling of 66920563 in words is "sixty-six million, nine hundred twenty thousand, five hundred sixty-three".