66561242 has 8 divisors (see below), whose sum is σ = 108918432. Its totient is φ = 30255100.

The previous prime is 66561233. The next prime is 66561251. The reversal of 66561242 is 24216566.

It is an interprime number because it is at equal distance from previous prime (66561233) and next prime (66561251).

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

It is a junction number, because it is equal to n+sod(n) for n = 66561199 and 66561208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1512734 + ... + 1512777.

It is an arithmetic number, because the mean of its divisors is an integer number (13614804).

Almost surely, 2^66561242 is an apocalyptic number.

66561242 is a deficient number, since it is larger than the sum of its proper divisors (42357190).

66561242 is a wasteful number, since it uses less digits than its factorization.

66561242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3025524.

The product of its digits is 17280, while the sum is 32.

The square root of 66561242 is about 8158.5073389683. The cubic root of 66561242 is about 405.2662822335.

The spelling of 66561242 in words is "sixty-six million, five hundred sixty-one thousand, two hundred forty-two".