664055749 has 4 divisors (see below), whose sum is σ = 758920864. Its totient is φ = 569190636.

The previous prime is 664055737. The next prime is 664055767. The reversal of 664055749 is 947550466.

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 not a de Polignac number, because 664055749 - 2¹⁵ = 664022981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664055699 and 664055708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664055779) 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, 47432547 + ... + 47432560.

It is an arithmetic number, because the mean of its divisors is an integer number (189730216).

Almost surely, 2^664055749 is an apocalyptic number.

It is an amenable number.

664055749 is a deficient number, since it is larger than the sum of its proper divisors (94865115).

664055749 is an equidigital number, since it uses as much as digits as its factorization.

664055749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94865114.

The product of its (nonzero) digits is 907200, while the sum is 46.

The square root of 664055749 is about 25769.2791711371. The cubic root of 664055749 is about 872.4385493786.

The spelling of 664055749 in words is "six hundred sixty-four million, fifty-five thousand, seven hundred forty-nine".