664767401 has 8 divisors (see below), whose sum is σ = 680692320. Its totient is φ = 648863712.

The previous prime is 664767373. The next prime is 664767431. The reversal of 664767401 is 104767466.

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 a de Polignac number, because none of the positive numbers 2^k-664767401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664767431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70970 + ... + 79788.

It is an arithmetic number, because the mean of its divisors is an integer number (85086540).

Almost surely, 2^664767401 is an apocalyptic number.

It is an amenable number.

664767401 is a deficient number, since it is larger than the sum of its proper divisors (15924919).

664767401 is a wasteful number, since it uses less digits than its factorization.

664767401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 664767401 is about 25783.0836208550. The cubic root of 664767401 is about 872.7500949981.

The spelling of 664767401 in words is "six hundred sixty-four million, seven hundred sixty-seven thousand, four hundred one".