66002431 has 4 divisors (see below), whose sum is σ = 72002664. Its totient is φ = 60002200.

The previous prime is 66002407. The next prime is 66002459. The reversal of 66002431 is 13420066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66002431 - 2⁵ = 66002399 is a prime.

It is a super-2 number, since 2×66002431² = 8712641795819522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66002401) 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, 3000100 + ... + 3000121.

It is an arithmetic number, because the mean of its divisors is an integer number (18000666).

Almost surely, 2^66002431 is an apocalyptic number.

66002431 is a deficient number, since it is larger than the sum of its proper divisors (6000233).

66002431 is a wasteful number, since it uses less digits than its factorization.

66002431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000232.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 66002431 is about 8124.1880209655. The cubic root of 66002431 is about 404.1289637460.

Adding to 66002431 its reverse (13420066), we get a palindrome (79422497).

The spelling of 66002431 in words is "sixty-six million, two thousand, four hundred thirty-one".