66742523 has 2 divisors, whose sum is σ = 66742524. Its totient is φ = 66742522.

The previous prime is 66742471. The next prime is 66742531. The reversal of 66742523 is 32524766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66742523 - 2⁸ = 66742267 is a prime.

It is not a weakly prime, because it can be changed into another prime (66742583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33371261 + 33371262.

It is an arithmetic number, because the mean of its divisors is an integer number (33371262).

Almost surely, 2^66742523 is an apocalyptic number.

66742523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66742523 is an equidigital number, since it uses as much as digits as its factorization.

66742523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

The square root of 66742523 is about 8169.6097214004. The cubic root of 66742523 is about 405.6338659256.

The spelling of 66742523 in words is "sixty-six million, seven hundred forty-two thousand, five hundred twenty-three".