66431101 has 8 divisors (see below), whose sum is σ = 73838304. Its totient is φ = 59251920.

The previous prime is 66431093. The next prime is 66431119. The reversal of 66431101 is 10113466.

It is a happy number.

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 66431101 - 2³ = 66431093 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66441101) 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 7 ways as a sum of consecutive naturals, for example, 56391 + ... + 57556.

It is an arithmetic number, because the mean of its divisors is an integer number (9229788).

Almost surely, 2^66431101 is an apocalyptic number.

It is an amenable number.

66431101 is a deficient number, since it is larger than the sum of its proper divisors (7407203).

66431101 is a wasteful number, since it uses less digits than its factorization.

66431101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114011.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 66431101 is about 8150.5276516309. The cubic root of 66431101 is about 405.0019834278.

Adding to 66431101 its reverse (10113466), we get a palindrome (76544567).

It can be divided in two parts, 6643 and 1101, that added together give a square (7744 = 88²).

The spelling of 66431101 in words is "sixty-six million, four hundred thirty-one thousand, one hundred one".