66220346 has 4 divisors (see below), whose sum is σ = 99330522. Its totient is φ = 33110172.

The previous prime is 66220337. The next prime is 66220393. The reversal of 66220346 is 64302266.

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., 43705321 + 22515025 = 6611^2 + 4745^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16555085 + ... + 16555088.

Almost surely, 2^66220346 is an apocalyptic number.

66220346 is a deficient number, since it is larger than the sum of its proper divisors (33110176).

66220346 is a wasteful number, since it uses less digits than its factorization.

66220346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33110175.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 66220346 is about 8137.5884634208. The cubic root of 66220346 is about 404.5732353648.

It can be divided in two parts, 66220 and 346, that added together give a palindrome (66566).

The spelling of 66220346 in words is "sixty-six million, two hundred twenty thousand, three hundred forty-six".