66563842 has 16 divisors (see below), whose sum is σ = 101479392. Its totient is φ = 32740960.

The previous prime is 66563807. The next prime is 66563867. The reversal of 66563842 is 24836566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66563795 and 66563804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45933 + ... + 47359.

It is an arithmetic number, because the mean of its divisors is an integer number (6342462).

Almost surely, 2^66563842 is an apocalyptic number.

66563842 is a deficient number, since it is larger than the sum of its proper divisors (34915550).

66563842 is a wasteful number, since it uses less digits than its factorization.

66563842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793.

The product of its digits is 207360, while the sum is 40.

The square root of 66563842 is about 8158.6666802854. Note that the first 4 decimals coincide. The cubic root of 66563842 is about 405.2715589711.

The spelling of 66563842 in words is "sixty-six million, five hundred sixty-three thousand, eight hundred forty-two".