66246646 has 4 divisors (see below), whose sum is σ = 99369972. Its totient is φ = 33123322.

The previous prime is 66246619. The next prime is 66246667. The reversal of 66246646 is 64664266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64664266 = 2 ⋅32332133.

It is a junction number, because it is equal to n+sod(n) for n = 66246599 and 66246608.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16561660 + ... + 16561663.

It is an arithmetic number, because the mean of its divisors is an integer number (24842493).

Almost surely, 2^66246646 is an apocalyptic number.

66246646 is a deficient number, since it is larger than the sum of its proper divisors (33123326).

66246646 is a wasteful number, since it uses less digits than its factorization.

66246646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33123325.

The product of its digits is 248832, while the sum is 40.

The square root of 66246646 is about 8139.2042608599. The cubic root of 66246646 is about 404.6267882299.

The spelling of 66246646 in words is "sixty-six million, two hundred forty-six thousand, six hundred forty-six".