66064402 has 4 divisors (see below), whose sum is σ = 99096606. Its totient is φ = 33032200.

The previous prime is 66064393. The next prime is 66064421. The reversal of 66064402 is 20446066.

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., 56085121 + 9979281 = 7489^2 + 3159^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16516099 + ... + 16516102.

Almost surely, 2^66064402 is an apocalyptic number.

66064402 is a deficient number, since it is larger than the sum of its proper divisors (33032204).

66064402 is a wasteful number, since it uses less digits than its factorization.

66064402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33032203.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66064402 is about 8128.0011072834. The cubic root of 66064402 is about 404.2554057650.

It can be divided in two parts, 66064 and 402, that added together give a palindrome (66466).

The spelling of 66064402 in words is "sixty-six million, sixty-four thousand, four hundred two".