66431001 has 32 divisors (see below), whose sum is σ = 111569920. Its totient is φ = 34219584.

The previous prime is 66430997. The next prime is 66431003. The reversal of 66431001 is 10013466.

It is not a de Polignac number, because 66431001 - 2² = 66430997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (66431003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8910 + ... + 14568.

It is an arithmetic number, because the mean of its divisors is an integer number (3486560).

Almost surely, 2^66431001 is an apocalyptic number.

It is an amenable number.

66431001 is a deficient number, since it is larger than the sum of its proper divisors (45138919).

66431001 is a wasteful number, since it uses less digits than its factorization.

66431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 66431001 is about 8150.5215170564. The cubic root of 66431001 is about 405.0017802086.

Adding to 66431001 its reverse (10013466), we get a palindrome (76444467).

The spelling of 66431001 in words is "sixty-six million, four hundred thirty-one thousand, one".