66612723 has 4 divisors (see below), whose sum is σ = 88816968. Its totient is φ = 44408480.

The previous prime is 66612703. The next prime is 66612731. The reversal of 66612723 is 32721666.

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 66612723 - 2¹² = 66608627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66612703) 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, 11102118 + ... + 11102123.

It is an arithmetic number, because the mean of its divisors is an integer number (22204242).

Almost surely, 2^66612723 is an apocalyptic number.

66612723 is a deficient number, since it is larger than the sum of its proper divisors (22204245).

66612723 is a wasteful number, since it uses less digits than its factorization.

66612723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22204244.

The product of its digits is 18144, while the sum is 33.

The square root of 66612723 is about 8161.6617793192. The cubic root of 66612723 is about 405.3707381014.

The spelling of 66612723 in words is "sixty-six million, six hundred twelve thousand, seven hundred twenty-three".