66340631 has 4 divisors (see below), whose sum is σ = 75817872. Its totient is φ = 56863392.

The previous prime is 66340621. The next prime is 66340633. The reversal of 66340631 is 13604366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13604366 = 2 ⋅6802183.

It is a cyclic number.

It is not a de Polignac number, because 66340631 - 2⁶ = 66340567 is a prime.

It is a super-2 number, since 2×66340631² = 8802158642956322, 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 = 66340594 and 66340603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66340633) 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, 4738610 + ... + 4738623.

It is an arithmetic number, because the mean of its divisors is an integer number (18954468).

Almost surely, 2^66340631 is an apocalyptic number.

66340631 is a deficient number, since it is larger than the sum of its proper divisors (9477241).

66340631 is an equidigital number, since it uses as much as digits as its factorization.

66340631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9477240.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 66340631 is about 8144.9758133465. The cubic root of 66340631 is about 404.8180476176.

Adding to 66340631 its reverse (13604366), we get a palindrome (79944997).

The spelling of 66340631 in words is "sixty-six million, three hundred forty thousand, six hundred thirty-one".