66219512 has 8 divisors (see below), whose sum is σ = 124161600. Its totient is φ = 33109752.

The previous prime is 66219493. The next prime is 66219563. The reversal of 66219512 is 21591266.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 4138712 + ... + 4138727.

It is an arithmetic number, because the mean of its divisors is an integer number (15520200).

Almost surely, 2^66219512 is an apocalyptic number.

It is an amenable number.

66219512 is a deficient number, since it is larger than the sum of its proper divisors (57942088).

66219512 is a wasteful number, since it uses less digits than its factorization.

66219512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8277445 (or 8277441 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 66219512 is about 8137.5372195769. The cubic root of 66219512 is about 404.5715369166.

The spelling of 66219512 in words is "sixty-six million, two hundred nineteen thousand, five hundred twelve".