66729556 has 24 divisors (see below), whose sum is σ = 123900840. Its totient is φ = 31337472.

The previous prime is 66729541. The next prime is 66729571. The reversal of 66729556 is 65592766.

It is an interprime number because it is at equal distance from previous prime (66729541) and next prime (66729571).

It can be written as a sum of positive squares in 4 ways, for example, as 13439556 + 53290000 = 3666^2 + 7300^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54406 + ... + 55618.

It is an arithmetic number, because the mean of its divisors is an integer number (5162535).

Almost surely, 2^66729556 is an apocalyptic number.

It is an amenable number.

66729556 is a deficient number, since it is larger than the sum of its proper divisors (57171284).

66729556 is a wasteful number, since it uses less digits than its factorization.

66729556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043 (or 2041 counting only the distinct ones).

The product of its digits is 680400, while the sum is 46.

The square root of 66729556 is about 8168.8160708881. The cubic root of 66729556 is about 405.6075948429.

The spelling of 66729556 in words is "sixty-six million, seven hundred twenty-nine thousand, five hundred fifty-six".