66213772 has 6 divisors (see below), whose sum is σ = 115874108. Its totient is φ = 33106884.

The previous prime is 66213769. The next prime is 66213781. The reversal of 66213772 is 27731266.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8276718 + ... + 8276725.

Almost surely, 2^66213772 is an apocalyptic number.

It is an amenable number.

66213772 is a deficient number, since it is larger than the sum of its proper divisors (49660336).

66213772 is a wasteful number, since it uses less digits than its factorization.

66213772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16553447 (or 16553445 counting only the distinct ones).

The product of its digits is 21168, while the sum is 34.

The square root of 66213772 is about 8137.1845253749. The cubic root of 66213772 is about 404.5598469697.

The spelling of 66213772 in words is "sixty-six million, two hundred thirteen thousand, seven hundred seventy-two".