66630154 has 4 divisors (see below), whose sum is σ = 99945234. Its totient is φ = 33315076.

The previous prime is 66630121. The next prime is 66630181. The reversal of 66630154 is 45103666.

66630154 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 37761025 + 28869129 = 6145^2 + 5373^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16657537 + ... + 16657540.

Almost surely, 2^66630154 is an apocalyptic number.

66630154 is a deficient number, since it is larger than the sum of its proper divisors (33315080).

66630154 is a wasteful number, since it uses less digits than its factorization.

66630154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33315079.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66630154 is about 8162.7295679815. The cubic root of 66630154 is about 405.4060937150.

The spelling of 66630154 in words is "sixty-six million, six hundred thirty thousand, one hundred fifty-four".