66721852 has 6 divisors (see below), whose sum is σ = 116763248. Its totient is φ = 33360924.

The previous prime is 66721847. The next prime is 66721871. The reversal of 66721852 is 25812766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340228 + ... + 8340235.

Almost surely, 2^66721852 is an apocalyptic number.

It is an amenable number.

66721852 is a deficient number, since it is larger than the sum of its proper divisors (50041396).

66721852 is a wasteful number, since it uses less digits than its factorization.

66721852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16680467 (or 16680465 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 66721852 is about 8168.3445079159. The cubic root of 66721852 is about 405.5919849625.

The spelling of 66721852 in words is "sixty-six million, seven hundred twenty-one thousand, eight hundred fifty-two".