664662541 has 4 divisors (see below), whose sum is σ = 699644800. Its totient is φ = 629680284.

The previous prime is 664662539. The next prime is 664662547. The reversal of 664662541 is 145266466.

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, and also an emirpimes, since its reverse is a distinct semiprime: 145266466 = 2 ⋅72633233.

It is a cyclic number.

It is not a de Polignac number, because 664662541 - 2¹ = 664662539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664662494 and 664662503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664662547) 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 3 ways as a sum of consecutive naturals, for example, 17491101 + ... + 17491138.

It is an arithmetic number, because the mean of its divisors is an integer number (174911200).

Almost surely, 2^664662541 is an apocalyptic number.

It is an amenable number.

664662541 is a deficient number, since it is larger than the sum of its proper divisors (34982259).

664662541 is a wasteful number, since it uses less digits than its factorization.

664662541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34982258.

The product of its digits is 207360, while the sum is 40.

The square root of 664662541 is about 25781.0500368003. The cubic root of 664662541 is about 872.7042035644.

The spelling of 664662541 in words is "six hundred sixty-four million, six hundred sixty-two thousand, five hundred forty-one".