66572756 has 6 divisors (see below), whose sum is σ = 116502330. Its totient is φ = 33286376.

The previous prime is 66572743. The next prime is 66572767. The reversal of 66572756 is 65727566.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 10562500 = 7484^2 + 3250^2 .

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, 8321591 + ... + 8321598.

It is an arithmetic number, because the mean of its divisors is an integer number (19417055).

Almost surely, 2^66572756 is an apocalyptic number.

It is an amenable number.

66572756 is a deficient number, since it is larger than the sum of its proper divisors (49929574).

66572756 is a wasteful number, since it uses less digits than its factorization.

66572756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16643193 (or 16643191 counting only the distinct ones).

The product of its digits is 529200, while the sum is 44.

The square root of 66572756 is about 8159.2129522399. The cubic root of 66572756 is about 405.2896490197.

The spelling of 66572756 in words is "sixty-six million, five hundred seventy-two thousand, seven hundred fifty-six".