664131401 has 8 divisors (see below), whose sum is σ = 703572480. Its totient is φ = 624731968.

The previous prime is 664131379. The next prime is 664131409. The reversal of 664131401 is 104131466.

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 664131401 - 2¹⁴ = 664115017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664131409) 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, 26120 + ... + 44838.

It is an arithmetic number, because the mean of its divisors is an integer number (87946560).

Almost surely, 2^664131401 is an apocalyptic number.

It is an amenable number.

664131401 is a deficient number, since it is larger than the sum of its proper divisors (39441079).

664131401 is a wasteful number, since it uses less digits than its factorization.

664131401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20823.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 664131401 is about 25770.7470012027. The cubic root of 664131401 is about 872.4716787330.

Adding to 664131401 its reverse (104131466), we get a palindrome (768262867).

The spelling of 664131401 in words is "six hundred sixty-four million, one hundred thirty-one thousand, four hundred one".