66416677 has 2 divisors, whose sum is σ = 66416678. Its totient is φ = 66416676.

The previous prime is 66416659. The next prime is 66416689. The reversal of 66416677 is 77661466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55860676 + 10556001 = 7474^2 + 3249^2 .

It is a cyclic number.

It is not a de Polignac number, because 66416677 - 2⁷ = 66416549 is a prime.

It is a super-2 number, since 2×66416677² = 8822349967444658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66416627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33208338 + 33208339.

It is an arithmetic number, because the mean of its divisors is an integer number (33208339).

Almost surely, 2^66416677 is an apocalyptic number.

It is an amenable number.

66416677 is a deficient number, since it is larger than the sum of its proper divisors (1).

66416677 is an equidigital number, since it uses as much as digits as its factorization.

66416677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 43.

The square root of 66416677 is about 8149.6427529064. The cubic root of 66416677 is about 404.9726689883.

The spelling of 66416677 in words is "sixty-six million, four hundred sixteen thousand, six hundred seventy-seven".