66420331 has 4 divisors (see below), whose sum is σ = 66471712. Its totient is φ = 66368952.

The previous prime is 66420317. The next prime is 66420379. The reversal of 66420331 is 13302466.

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 66420331 - 2⁹ = 66419819 is a prime.

It is a super-2 number, since 2×66420331² = 8823320740299122, 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 = 66420296 and 66420305.

It is not an unprimeable number, because it can be changed into a prime (66420301) 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, 23700 + ... + 26353.

It is an arithmetic number, because the mean of its divisors is an integer number (16617928).

Almost surely, 2^66420331 is an apocalyptic number.

66420331 is a deficient number, since it is larger than the sum of its proper divisors (51381).

66420331 is a wasteful number, since it uses less digits than its factorization.

66420331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51380.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 66420331 is about 8149.8669314290. The cubic root of 66420331 is about 404.9800955518.

Adding to 66420331 its reverse (13302466), we get a palindrome (79722797).

The spelling of 66420331 in words is "sixty-six million, four hundred twenty thousand, three hundred thirty-one".