664122641 has 32 divisors (see below), whose sum is σ = 847300608. Its totient is φ = 506373120.

The previous prime is 664122619. The next prime is 664122653. The reversal of 664122641 is 146221466.

664122641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664122641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664122598 and 664122607.

It is not an unprimeable number, because it can be changed into a prime (664122691) 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, 1119641 + ... + 1120233.

It is an arithmetic number, because the mean of its divisors is an integer number (26478144).

Almost surely, 2^664122641 is an apocalyptic number.

It is an amenable number.

664122641 is a deficient number, since it is larger than the sum of its proper divisors (183177967).

664122641 is a wasteful number, since it uses less digits than its factorization.

664122641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041.

The product of its digits is 13824, while the sum is 32.

The square root of 664122641 is about 25770.5770404933. The cubic root of 664122641 is about 872.4678427022.

The spelling of 664122641 in words is "six hundred sixty-four million, one hundred twenty-two thousand, six hundred forty-one".