66214631 has 24 divisors (see below), whose sum is σ = 82391904. Its totient is φ = 52926720.

The previous prime is 66214607. The next prime is 66214637. The reversal of 66214631 is 13641266.

It is a happy number.

It is not a de Polignac number, because 66214631 - 2¹⁴ = 66198247 is a prime.

It is a super-2 number, since 2×66214631² = 8768754716932322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66214594 and 66214603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66214637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45491 + ... + 46923.

It is an arithmetic number, because the mean of its divisors is an integer number (3432996).

Almost surely, 2^66214631 is an apocalyptic number.

66214631 is a deficient number, since it is larger than the sum of its proper divisors (16177273).

66214631 is a wasteful number, since it uses less digits than its factorization.

66214631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1504 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 66214631 is about 8137.2373075879. The cubic root of 66214631 is about 404.5615964316.

Adding to 66214631 its reverse (13641266), we get a palindrome (79855897).

The spelling of 66214631 in words is "sixty-six million, two hundred fourteen thousand, six hundred thirty-one".