66111523 has 2 divisors, whose sum is σ = 66111524. Its totient is φ = 66111522.

The previous prime is 66111497. The next prime is 66111527. The reversal of 66111523 is 32511166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66111523 - 2⁵ = 66111491 is a prime.

It is not a weakly prime, because it can be changed into another prime (66111527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33055761 + 33055762.

It is an arithmetic number, because the mean of its divisors is an integer number (33055762).

Almost surely, 2^66111523 is an apocalyptic number.

66111523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66111523 is an equidigital number, since it uses as much as digits as its factorization.

66111523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 66111523 is about 8130.8992737581. The cubic root of 66111523 is about 404.3514957987.

Adding to 66111523 its reverse (32511166), we get a palindrome (98622689).

The spelling of 66111523 in words is "sixty-six million, one hundred eleven thousand, five hundred twenty-three".