664391041 has 4 divisors (see below), whose sum is σ = 693277632. Its totient is φ = 635504452.

The previous prime is 664391011. The next prime is 664391053. The reversal of 664391041 is 140193466.

664391041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664391041 - 2⁵ = 664391009 is a prime.

It is a super-2 number, since 2×664391041² = 882830910722127362, 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 = 664390988 and 664391006.

It is not an unprimeable number, because it can be changed into a prime (664391011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14443261 + ... + 14443306.

It is an arithmetic number, because the mean of its divisors is an integer number (173319408).

Almost surely, 2^664391041 is an apocalyptic number.

It is an amenable number.

664391041 is a deficient number, since it is larger than the sum of its proper divisors (28886591).

664391041 is a wasteful number, since it uses less digits than its factorization.

664391041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28886590.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 664391041 is about 25775.7840035953. The cubic root of 664391041 is about 872.5853605700.

The spelling of 664391041 in words is "six hundred sixty-four million, three hundred ninety-one thousand, forty-one".