66777341 has 4 divisors (see below), whose sum is σ = 68582172. Its totient is φ = 64972512.

The previous prime is 66777331. The next prime is 66777353. The reversal of 66777341 is 14377766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60295225 + 6482116 = 7765^2 + 2546^2 .

It is a cyclic number.

It is not a de Polignac number, because 66777341 - 2¹⁴ = 66760957 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 (66777301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902360 + ... + 902433.

It is an arithmetic number, because the mean of its divisors is an integer number (17145543).

Almost surely, 2^66777341 is an apocalyptic number.

It is an amenable number.

66777341 is a deficient number, since it is larger than the sum of its proper divisors (1804831).

66777341 is a wasteful number, since it uses less digits than its factorization.

66777341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804830.

The product of its digits is 148176, while the sum is 41.

The square root of 66777341 is about 8171.7403899047. The cubic root of 66777341 is about 405.7043902034.

The spelling of 66777341 in words is "sixty-six million, seven hundred seventy-seven thousand, three hundred forty-one".