66601057 has 2 divisors, whose sum is σ = 66601058. Its totient is φ = 66601056.

The previous prime is 66601037. The next prime is 66601091. The reversal of 66601057 is 75010666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39237696 + 27363361 = 6264^2 + 5231^2 .

It is a cyclic number.

It is not a de Polignac number, because 66601057 - 2⁷ = 66600929 is a prime.

It is not a weakly prime, because it can be changed into another prime (66601027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33300528 + 33300529.

It is an arithmetic number, because the mean of its divisors is an integer number (33300529).

Almost surely, 2^66601057 is an apocalyptic number.

It is an amenable number.

66601057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66601057 is an equidigital number, since it uses as much as digits as its factorization.

66601057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 66601057 is about 8160.9470651389. The cubic root of 66601057 is about 405.3470722965.

The spelling of 66601057 in words is "sixty-six million, six hundred one thousand, fifty-seven".