664923941 has 8 divisors (see below), whose sum is σ = 768040704. Its totient is φ = 568918720.

The previous prime is 664923881. The next prime is 664923949. The reversal of 664923941 is 149329466.

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 not a de Polignac number, because 664923941 - 2⁶ = 664923877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664923892 and 664923901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664923949) 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, 1777685 + ... + 1778058.

It is an arithmetic number, because the mean of its divisors is an integer number (96005088).

Almost surely, 2^664923941 is an apocalyptic number.

It is an amenable number.

664923941 is a deficient number, since it is larger than the sum of its proper divisors (103116763).

664923941 is a wasteful number, since it uses less digits than its factorization.

664923941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3555771.

The product of its digits is 279936, while the sum is 44.

The square root of 664923941 is about 25786.1191535291. The cubic root of 664923941 is about 872.8185949362.

The spelling of 664923941 in words is "six hundred sixty-four million, nine hundred twenty-three thousand, nine hundred forty-one".