66317431 has 8 divisors (see below), whose sum is σ = 69228704. Its totient is φ = 63465120.

The previous prime is 66317417. The next prime is 66317437. The reversal of 66317431 is 13471366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66317431 - 2⁵ = 66317399 is a prime.

It is a super-2 number, since 2×66317431² = 8796003308879522, 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 = 66317393 and 66317402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66317437) 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 7 ways as a sum of consecutive naturals, for example, 12435 + ... + 16948.

It is an arithmetic number, because the mean of its divisors is an integer number (8653588).

Almost surely, 2^66317431 is an apocalyptic number.

66317431 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66317431 is a deficient number, since it is larger than the sum of its proper divisors (2911273).

66317431 is a wasteful number, since it uses less digits than its factorization.

66317431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29481.

The product of its digits is 9072, while the sum is 31.

The square root of 66317431 is about 8143.5514979645. The cubic root of 66317431 is about 404.7708524393.

Adding to 66317431 its reverse (13471366), we get a palindrome (79788797).

The spelling of 66317431 in words is "sixty-six million, three hundred seventeen thousand, four hundred thirty-one".