66520963 has 2 divisors, whose sum is σ = 66520964. Its totient is φ = 66520962.

The previous prime is 66520913. The next prime is 66520969. The reversal of 66520963 is 36902566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66520963 is a prime.

It is not a weakly prime, because it can be changed into another prime (66520969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33260481 + 33260482.

It is an arithmetic number, because the mean of its divisors is an integer number (33260482).

Almost surely, 2^66520963 is an apocalyptic number.

66520963 is a deficient number, since it is larger than the sum of its proper divisors (1).

66520963 is an equidigital number, since it uses as much as digits as its factorization.

66520963 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 66520963 is about 8156.0384378692. The cubic root of 66520963 is about 405.1845178617.

The spelling of 66520963 in words is "sixty-six million, five hundred twenty thousand, nine hundred sixty-three".