66506842 has 16 divisors (see below), whose sum is σ = 103428864. Its totient is φ = 32040000.

The previous prime is 66506827. The next prime is 66506849. The reversal of 66506842 is 24860566.

It is not an unprimeable number, because it can be changed into a prime (66506849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12717 + ... + 17167.

It is an arithmetic number, because the mean of its divisors is an integer number (6464304).

Almost surely, 2^66506842 is an apocalyptic number.

66506842 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66506842 is a deficient number, since it is larger than the sum of its proper divisors (36922022).

66506842 is a wasteful number, since it uses less digits than its factorization.

66506842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 66506842 is about 8155.1727142961. The cubic root of 66506842 is about 405.1558451184.

The spelling of 66506842 in words is "sixty-six million, five hundred six thousand, eight hundred forty-two".