66919542 has 8 divisors (see below), whose sum is σ = 133839096. Its totient is φ = 22306512.

The previous prime is 66919529. The next prime is 66919543. The reversal of 66919542 is 24591966.

It is a happy number.

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

66919542 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 66919494 and 66919503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66919543) by changing a digit.

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, 5576623 + ... + 5576634.

It is an arithmetic number, because the mean of its divisors is an integer number (16729887).

Almost surely, 2^66919542 is an apocalyptic number.

66919542 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.

66919542 is a wasteful number, since it uses less digits than its factorization.

66919542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11153262.

The product of its digits is 116640, while the sum is 42.

The square root of 66919542 is about 8180.4365409188. The cubic root of 66919542 is about 405.9921657996.

The spelling of 66919542 in words is "sixty-six million, nine hundred nineteen thousand, five hundred forty-two".