66620602 has 4 divisors (see below), whose sum is σ = 99930906. Its totient is φ = 33310300.

The previous prime is 66620599. The next prime is 66620611. The reversal of 66620602 is 20602666.

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., 36469521 + 30151081 = 6039^2 + 5491^2 .

It is a super-2 number, since 2×66620602² = 8876609221684808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16655149 + ... + 16655152.

Almost surely, 2^66620602 is an apocalyptic number.

66620602 is a deficient number, since it is larger than the sum of its proper divisors (33310304).

66620602 is a wasteful number, since it uses less digits than its factorization.

66620602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33310303.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66620602 is about 8162.1444486115. The cubic root of 66620602 is about 405.3867199839.

The spelling of 66620602 in words is "sixty-six million, six hundred twenty thousand, six hundred two".