66342857 has 16 divisors (see below), whose sum is σ = 81308160. Its totient is φ = 52835328.

The previous prime is 66342839. The next prime is 66342863. The reversal of 66342857 is 75824366.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66342857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66342817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5873 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (5081760).

Almost surely, 2^66342857 is an apocalyptic number.

It is an amenable number.

66342857 is a deficient number, since it is larger than the sum of its proper divisors (14965303).

66342857 is a wasteful number, since it uses less digits than its factorization.

66342857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7160.

The product of its digits is 241920, while the sum is 41.

The square root of 66342857 is about 8145.1124608565. The cubic root of 66342857 is about 404.8225753350.

The spelling of 66342857 in words is "sixty-six million, three hundred forty-two thousand, eight hundred fifty-seven".