66677701 has 4 divisors (see below), whose sum is σ = 66969100. Its totient is φ = 66386304.

The previous prime is 66677693. The next prime is 66677719. The reversal of 66677701 is 10777666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10777666 = 2 ⋅5388833.

It can be written as a sum of positive squares in 2 ways, for example, as 25704900 + 40972801 = 5070^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 66677701 - 2³ = 66677693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677731) 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 3 ways as a sum of consecutive naturals, for example, 145356 + ... + 145813.

It is an arithmetic number, because the mean of its divisors is an integer number (16742275).

Almost surely, 2^66677701 is an apocalyptic number.

It is an amenable number.

66677701 is a deficient number, since it is larger than the sum of its proper divisors (291399).

66677701 is a wasteful number, since it uses less digits than its factorization.

66677701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291398.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 66677701 is about 8165.6414934774. The cubic root of 66677701 is about 405.5025028188.

The spelling of 66677701 in words is "sixty-six million, six hundred seventy-seven thousand, seven hundred one".