66961066 has 8 divisors (see below), whose sum is σ = 100476324. Its totient is φ = 33468960.

The previous prime is 66961057. The next prime is 66961067. The reversal of 66961066 is 66016966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66896041 + 65025 = 8179^2 + 255^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66961067) 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, 8446 + ... + 14326.

Almost surely, 2^66961066 is an apocalyptic number.

66961066 is a deficient number, since it is larger than the sum of its proper divisors (33515258).

66961066 is a wasteful number, since it uses less digits than its factorization.

66961066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11576.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 66961066 is about 8182.9741536925. The cubic root of 66961066 is about 406.0761220077.

The spelling of 66961066 in words is "sixty-six million, nine hundred sixty-one thousand, sixty-six".