66570961 has 2 divisors, whose sum is σ = 66570962. Its totient is φ = 66570960.

The previous prime is 66570953. The next prime is 66570989. The reversal of 66570961 is 16907566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66520336 + 50625 = 8156^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 66570961 - 2³ = 66570953 is a prime.

It is not a weakly prime, because it can be changed into another prime (66570991) 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, 33285480 + 33285481.

It is an arithmetic number, because the mean of its divisors is an integer number (33285481).

Almost surely, 2^66570961 is an apocalyptic number.

It is an amenable number.

66570961 is a deficient number, since it is larger than the sum of its proper divisors (1).

66570961 is an equidigital number, since it uses as much as digits as its factorization.

66570961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 66570961 is about 8159.1029531438. The cubic root of 66570961 is about 405.2860063812.

The spelling of 66570961 in words is "sixty-six million, five hundred seventy thousand, nine hundred sixty-one".