66904106 has 4 divisors (see below), whose sum is σ = 100356162. Its totient is φ = 33452052.

The previous prime is 66904099. The next prime is 66904121. The reversal of 66904106 is 60140966.

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., 57138481 + 9765625 = 7559^2 + 3125^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16726025 + ... + 16726028.

Almost surely, 2^66904106 is an apocalyptic number.

66904106 is a deficient number, since it is larger than the sum of its proper divisors (33452056).

66904106 is a wasteful number, since it uses less digits than its factorization.

66904106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33452055.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 66904106 is about 8179.4930160738. The cubic root of 66904106 is about 405.9609473304.

The spelling of 66904106 in words is "sixty-six million, nine hundred four thousand, one hundred six".