66051604 has 6 divisors (see below), whose sum is σ = 115590314. Its totient is φ = 33025800.

The previous prime is 66051599. The next prime is 66051611. The reversal of 66051604 is 40615066.

It can be written as a sum of positive squares in only one way, i.e., 62441604 + 3610000 = 7902^2 + 1900^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256447 + ... + 8256454.

Almost surely, 2^66051604 is an apocalyptic number.

It is an amenable number.

66051604 is a deficient number, since it is larger than the sum of its proper divisors (49538710).

66051604 is a wasteful number, since it uses less digits than its factorization.

66051604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16512905 (or 16512903 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66051604 is about 8127.2137907157. The cubic root of 66051604 is about 404.2292999519.

The spelling of 66051604 in words is "sixty-six million, fifty-one thousand, six hundred four".