66491246 has 4 divisors (see below), whose sum is σ = 99736872. Its totient is φ = 33245622.

The previous prime is 66491239. The next prime is 66491261. The reversal of 66491246 is 64219466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64219466 = 2 ⋅32109733.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16622810 + ... + 16622813.

It is an arithmetic number, because the mean of its divisors is an integer number (24934218).

Almost surely, 2^66491246 is an apocalyptic number.

66491246 is a deficient number, since it is larger than the sum of its proper divisors (33245626).

66491246 is a wasteful number, since it uses less digits than its factorization.

66491246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33245625.

The product of its digits is 62208, while the sum is 38.

The square root of 66491246 is about 8154.2164553070. The cubic root of 66491246 is about 405.1241726651.

The spelling of 66491246 in words is "sixty-six million, four hundred ninety-one thousand, two hundred forty-six".