66747623 has 4 divisors (see below), whose sum is σ = 67662048. Its totient is φ = 65833200.

The previous prime is 66747613. The next prime is 66747643. The reversal of 66747623 is 32674766.

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 66747623 - 2⁸ = 66747367 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 (66747613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457103 + ... + 457248.

It is an arithmetic number, because the mean of its divisors is an integer number (16915512).

Almost surely, 2^66747623 is an apocalyptic number.

66747623 is a deficient number, since it is larger than the sum of its proper divisors (914425).

66747623 is an equidigital number, since it uses as much as digits as its factorization.

66747623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914424.

The product of its digits is 254016, while the sum is 41.

The square root of 66747623 is about 8169.9218478514. The cubic root of 66747623 is about 405.6441975699.

The spelling of 66747623 in words is "sixty-six million, seven hundred forty-seven thousand, six hundred twenty-three".