66884057 has 2 divisors, whose sum is σ = 66884058. Its totient is φ = 66884056.

The previous prime is 66884033. The next prime is 66884071. The reversal of 66884057 is 75048866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39677401 + 27206656 = 6299^2 + 5216^2 .

It is a cyclic number.

It is not a de Polignac number, because 66884057 - 2¹² = 66879961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66883999 and 66884017.

It is not a weakly prime, because it can be changed into another prime (66884087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33442028 + 33442029.

It is an arithmetic number, because the mean of its divisors is an integer number (33442029).

Almost surely, 2^66884057 is an apocalyptic number.

It is an amenable number.

66884057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66884057 is an equidigital number, since it uses as much as digits as its factorization.

66884057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66884057 is about 8178.2673592883. The cubic root of 66884057 is about 405.9203921505.

The spelling of 66884057 in words is "sixty-six million, eight hundred eighty-four thousand, fifty-seven".