66436431 has 4 divisors (see below), whose sum is σ = 88581912. Its totient is φ = 44290952.

The previous prime is 66436417. The next prime is 66436439. The reversal of 66436431 is 13463466.

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 66436431 - 2⁵ = 66436399 is a prime.

It is a super-2 number, since 2×66436431² = 8827598728035522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66436392 and 66436401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66436439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11072736 + ... + 11072741.

It is an arithmetic number, because the mean of its divisors is an integer number (22145478).

Almost surely, 2^66436431 is an apocalyptic number.

66436431 is a deficient number, since it is larger than the sum of its proper divisors (22145481).

66436431 is a wasteful number, since it uses less digits than its factorization.

66436431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22145480.

The product of its digits is 31104, while the sum is 33.

The square root of 66436431 is about 8150.8546177686. The cubic root of 66436431 is about 405.0128147142.

Adding to 66436431 its reverse (13463466), we get a palindrome (79899897).

The spelling of 66436431 in words is "sixty-six million, four hundred thirty-six thousand, four hundred thirty-one".