66431572 has 12 divisors (see below), whose sum is σ = 117990880. Its totient is φ = 32719896.

The previous prime is 66431569. The next prime is 66431579. The reversal of 66431572 is 27513466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66431579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123672 + ... + 124207.

Almost surely, 2^66431572 is an apocalyptic number.

It is an amenable number.

66431572 is a deficient number, since it is larger than the sum of its proper divisors (51559308).

66431572 is a wasteful number, since it uses less digits than its factorization.

66431572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247950 (or 247948 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 66431572 is about 8150.5565454146. The cubic root of 66431572 is about 405.0029405873.

The spelling of 66431572 in words is "sixty-six million, four hundred thirty-one thousand, five hundred seventy-two".