66600623 has 4 divisors (see below), whose sum is σ = 66619320. Its totient is φ = 66581928.

The previous prime is 66600587. The next prime is 66600631. The reversal of 66600623 is 32600666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66600623 - 2⁸ = 66600367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66600223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165 + ... + 11742.

It is an arithmetic number, because the mean of its divisors is an integer number (16654830).

Almost surely, 2^66600623 is an apocalyptic number.

66600623 is a deficient number, since it is larger than the sum of its proper divisors (18697).

66600623 is a wasteful number, since it uses less digits than its factorization.

66600623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18696.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 66600623 is about 8160.9204750445. The cubic root of 66600623 is about 405.3461918249.

The spelling of 66600623 in words is "sixty-six million, six hundred thousand, six hundred twenty-three".