66517652 has 6 divisors (see below), whose sum is σ = 116405898. Its totient is φ = 33258824.

The previous prime is 66517639. The next prime is 66517657. The reversal of 66517652 is 25671566.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 1811716 = 8044^2 + 1346^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66517657) by changing a digit.

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, 8314703 + ... + 8314710.

It is an arithmetic number, because the mean of its divisors is an integer number (19400983).

Almost surely, 2^66517652 is an apocalyptic number.

It is an amenable number.

66517652 is a deficient number, since it is larger than the sum of its proper divisors (49888246).

66517652 is a wasteful number, since it uses less digits than its factorization.

66517652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16629417 (or 16629415 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 66517652 is about 8155.8354568983. The cubic root of 66517652 is about 405.1777952280.

The spelling of 66517652 in words is "sixty-six million, five hundred seventeen thousand, six hundred fifty-two".