66976849 has 2 divisors, whose sum is σ = 66976850. Its totient is φ = 66976848.

The previous prime is 66976829. The next prime is 66976867. The reversal of 66976849 is 94867966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62916624 + 4060225 = 7932^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 66976849 - 2¹⁵ = 66944081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66976849.

It is not a weakly prime, because it can be changed into another prime (66976829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33488424 + 33488425.

It is an arithmetic number, because the mean of its divisors is an integer number (33488425).

Almost surely, 2^66976849 is an apocalyptic number.

It is an amenable number.

66976849 is a deficient number, since it is larger than the sum of its proper divisors (1).

66976849 is an equidigital number, since it uses as much as digits as its factorization.

66976849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The square root of 66976849 is about 8183.9384772859. The cubic root of 66976849 is about 406.1080241081.

The spelling of 66976849 in words is "sixty-six million, nine hundred seventy-six thousand, eight hundred forty-nine".