66616677 has 12 divisors (see below), whose sum is σ = 98571564. Its totient is φ = 43327680.

The previous prime is 66616663. The next prime is 66616691. The reversal of 66616677 is 77661666.

It is an interprime number because it is at equal distance from previous prime (66616663) and next prime (66616691).

It can be written as a sum of positive squares in 2 ways, for example, as 21538881 + 45077796 = 4641^2 + 6714^2 .

It is not a de Polignac number, because 66616677 - 2¹⁴ = 66600293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66616657) 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 in 11 ways as a sum of consecutive naturals, for example, 89898 + ... + 90635.

It is an arithmetic number, because the mean of its divisors is an integer number (8214297).

Almost surely, 2^66616677 is an apocalyptic number.

It is an amenable number.

66616677 is a deficient number, since it is larger than the sum of its proper divisors (31954887).

66616677 is a wasteful number, since it uses less digits than its factorization.

66616677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180580 (or 180577 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 66616677 is about 8161.9040058065. The cubic root of 66616677 is about 405.3787586122.

The spelling of 66616677 in words is "sixty-six million, six hundred sixteen thousand, six hundred seventy-seven".