61366666 has 8 divisors (see below), whose sum is σ = 92527524. Its totient is φ = 30524160.

The previous prime is 61366663. The next prime is 61366681. The reversal of 61366666 is 66666316.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57836025 + 3530641 = 7605^2 + 1879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

61366666 is a modest number, since divided by 6666 gives 6136 as remainder.

It is not an unprimeable number, because it can be changed into a prime (61366661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79105 + ... + 79876.

Almost surely, 2^61366666 is an apocalyptic number.

61366666 is a deficient number, since it is larger than the sum of its proper divisors (31160858).

61366666 is a wasteful number, since it uses less digits than its factorization.

61366666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159176.

The product of its digits is 139968, while the sum is 40.

The square root of 61366666 is about 7833.6878926850. The cubic root of 61366666 is about 394.4368752954.

The spelling of 61366666 in words is "sixty-one million, three hundred sixty-six thousand, six hundred sixty-six".