66242986 has 4 divisors (see below), whose sum is σ = 99364482. Its totient is φ = 33121492.

The previous prime is 66242983. The next prime is 66242993. The reversal of 66242986 is 68924266.

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

It can be written as a sum of positive squares in only one way, i.e., 65108761 + 1134225 = 8069^2 + 1065^2 .

It is not an unprimeable number, because it can be changed into a prime (66242983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16560745 + ... + 16560748.

Almost surely, 2^66242986 is an apocalyptic number.

66242986 is a deficient number, since it is larger than the sum of its proper divisors (33121496).

66242986 is a wasteful number, since it uses less digits than its factorization.

66242986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33121495.

The product of its digits is 248832, while the sum is 43.

The square root of 66242986 is about 8138.9794200502. The cubic root of 66242986 is about 404.6193364750.

The spelling of 66242986 in words is "sixty-six million, two hundred forty-two thousand, nine hundred eighty-six".