66142523 has 2 divisors, whose sum is σ = 66142524. Its totient is φ = 66142522.

The previous prime is 66142511. The next prime is 66142541. The reversal of 66142523 is 32524166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66142523 - 2⁴ = 66142507 is a prime.

It is a super-4 number, since 4×66142523⁴ (a number of 32 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66142123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33071261 + 33071262.

It is an arithmetic number, because the mean of its divisors is an integer number (33071262).

Almost surely, 2^66142523 is an apocalyptic number.

66142523 is a deficient number, since it is larger than the sum of its proper divisors (1).

66142523 is an equidigital number, since it uses as much as digits as its factorization.

66142523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 66142523 is about 8132.8053585463. The cubic root of 66142523 is about 404.4146866873.

Adding to 66142523 its reverse (32524166), we get a palindrome (98666689).

The spelling of 66142523 in words is "sixty-six million, one hundred forty-two thousand, five hundred twenty-three".