66142663 has 4 divisors (see below), whose sum is σ = 66159520. Its totient is φ = 66125808.

The previous prime is 66142621. The next prime is 66142697. The reversal of 66142663 is 36624166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66142663 - 2⁹ = 66142151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66142613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898 + ... + 11536.

It is an arithmetic number, because the mean of its divisors is an integer number (16539880).

Almost surely, 2^66142663 is an apocalyptic number.

66142663 is a deficient number, since it is larger than the sum of its proper divisors (16857).

66142663 is a wasteful number, since it uses less digits than its factorization.

66142663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16856.

The product of its digits is 31104, while the sum is 34.

The square root of 66142663 is about 8132.8139656579. The cubic root of 66142663 is about 404.4149720207.

The spelling of 66142663 in words is "sixty-six million, one hundred forty-two thousand, six hundred sixty-three".