66535604 has 6 divisors (see below), whose sum is σ = 116437314. Its totient is φ = 33267800.

The previous prime is 66535589. The next prime is 66535607. The reversal of 66535604 is 40653566.

It can be written as a sum of positive squares in only one way, i.e., 60871204 + 5664400 = 7802^2 + 2380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66535607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8316947 + ... + 8316954.

It is an arithmetic number, because the mean of its divisors is an integer number (19406219).

Almost surely, 2^66535604 is an apocalyptic number.

It is an amenable number.

66535604 is a deficient number, since it is larger than the sum of its proper divisors (49901710).

66535604 is a wasteful number, since it uses less digits than its factorization.

66535604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16633905 (or 16633903 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 66535604 is about 8156.9359443360. The cubic root of 66535604 is about 405.2142421826.

The spelling of 66535604 in words is "sixty-six million, five hundred thirty-five thousand, six hundred four".