66857442 has 8 divisors (see below), whose sum is σ = 133714896. Its totient is φ = 22285812.

The previous prime is 66857431. The next prime is 66857459. The reversal of 66857442 is 24475866.

It is a sphenic number, since it is the product of 3 distinct primes.

66857442 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 66857394 and 66857403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5571448 + ... + 5571459.

It is an arithmetic number, because the mean of its divisors is an integer number (16714362).

Almost surely, 2^66857442 is an apocalyptic number.

66857442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66857442 is a wasteful number, since it uses less digits than its factorization.

66857442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11142912.

The product of its digits is 322560, while the sum is 42.

The square root of 66857442 is about 8176.6400189809. The cubic root of 66857442 is about 405.8665427228.

The spelling of 66857442 in words is "sixty-six million, eight hundred fifty-seven thousand, four hundred forty-two".