66725623 has 2 divisors, whose sum is σ = 66725624. Its totient is φ = 66725622.

The previous prime is 66725579. The next prime is 66725639. The reversal of 66725623 is 32652766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66725623 - 2²¹ = 64628471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66725123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33362811 + 33362812.

It is an arithmetic number, because the mean of its divisors is an integer number (33362812).

Almost surely, 2^66725623 is an apocalyptic number.

66725623 is a deficient number, since it is larger than the sum of its proper divisors (1).

66725623 is an equidigital number, since it uses as much as digits as its factorization.

66725623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 37.

The square root of 66725623 is about 8168.5753347815. The cubic root of 66725623 is about 405.5996259302.

The spelling of 66725623 in words is "sixty-six million, seven hundred twenty-five thousand, six hundred twenty-three".