66347623 has 4 divisors (see below), whose sum is σ = 68140840. Its totient is φ = 64554408.

The previous prime is 66347599. The next prime is 66347647. The reversal of 66347623 is 32674366.

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

It is an interprime number because it is at equal distance from previous prime (66347599) and next prime (66347647).

It is a cyclic number.

It is not a de Polignac number, because 66347623 - 2⁵ = 66347591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1793179 = 66347623 / (6 + 6 + 3 + 4 + 7 + 6 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66347653) 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, 896553 + ... + 896626.

It is an arithmetic number, because the mean of its divisors is an integer number (17035210).

Almost surely, 2^66347623 is an apocalyptic number.

66347623 is a deficient number, since it is larger than the sum of its proper divisors (1793217).

66347623 is a wasteful number, since it uses less digits than its factorization.

66347623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793216.

The product of its digits is 108864, while the sum is 37.

The square root of 66347623 is about 8145.4050236928. The cubic root of 66347623 is about 404.8322691101.

The spelling of 66347623 in words is "sixty-six million, three hundred forty-seven thousand, six hundred twenty-three".