66214431 has 24 divisors (see below), whose sum is σ = 98047040. Its totient is φ = 43047936.

The previous prime is 66214409. The next prime is 66214441. The reversal of 66214431 is 13441266.

66214431 is a `hidden beast` number, since 6 + 621 + 4 + 4 + 31 = 666.

It is not a de Polignac number, because 66214431 - 2¹¹ = 66212383 is a prime.

It is a super-2 number, since 2×66214431² = 8768701745307522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66214395 and 66214404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66214441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63210 + ... + 64248.

Almost surely, 2^66214431 is an apocalyptic number.

66214431 is a deficient number, since it is larger than the sum of its proper divisors (31832609).

66214431 is a wasteful number, since it uses less digits than its factorization.

66214431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1212 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 66214431 is about 8137.2250183954. The cubic root of 66214431 is about 404.5611891077.

Adding to 66214431 its reverse (13441266), we get a palindrome (79655697).

The spelling of 66214431 in words is "sixty-six million, two hundred fourteen thousand, four hundred thirty-one".