66190812 has 24 divisors (see below), whose sum is σ = 155010576. Its totient is φ = 21982848.

The previous prime is 66190807. The next prime is 66190819. The reversal of 66190812 is 21809166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66190819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6633 + ... + 13280.

It is an arithmetic number, because the mean of its divisors is an integer number (6458774).

Almost surely, 2^66190812 is an apocalyptic number.

It is an amenable number.

66190812 is an abundant number, since it is smaller than the sum of its proper divisors (88819764).

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

66190812 is a wasteful number, since it uses less digits than its factorization.

66190812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20197 (or 20195 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 66190812 is about 8135.7735956699. The cubic root of 66190812 is about 404.5130804253.

Adding to 66190812 its reverse (21809166), we get a palindrome (87999978).

The spelling of 66190812 in words is "sixty-six million, one hundred ninety thousand, eight hundred twelve".