66051556 has 6 divisors (see below), whose sum is σ = 115590230. Its totient is φ = 33025776.

The previous prime is 66051547. The next prime is 66051571. The reversal of 66051556 is 65515066.

It can be written as a sum of positive squares in only one way, i.e., 43164900 + 22886656 = 6570^2 + 4784^2 .

It is a super-2 number, since 2×66051556² = 8725616100042272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8256441 + ... + 8256448.

Almost surely, 2^66051556 is an apocalyptic number.

It is an amenable number.

66051556 is a deficient number, since it is larger than the sum of its proper divisors (49538674).

66051556 is a wasteful number, since it uses less digits than its factorization.

66051556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16512893 (or 16512891 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 66051556 is about 8127.2108376736. The cubic root of 66051556 is about 404.2292020334.

The spelling of 66051556 in words is "sixty-six million, fifty-one thousand, five hundred fifty-six".