66375623 has 2 divisors, whose sum is σ = 66375624. Its totient is φ = 66375622.

The previous prime is 66375613. The next prime is 66375629. The reversal of 66375623 is 32657366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66375623 - 2⁶ = 66375559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66375629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33187811 + 33187812.

It is an arithmetic number, because the mean of its divisors is an integer number (33187812).

Almost surely, 2^66375623 is an apocalyptic number.

66375623 is a deficient number, since it is larger than the sum of its proper divisors (1).

66375623 is an equidigital number, since it uses as much as digits as its factorization.

66375623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 38.

The square root of 66375623 is about 8147.1236028429. The cubic root of 66375623 is about 404.8892101569.

The spelling of 66375623 in words is "sixty-six million, three hundred seventy-five thousand, six hundred twenty-three".