665336749 has 12 divisors (see below), whose sum is σ = 844324128. Its totient is φ = 518443800.

The previous prime is 665336743. The next prime is 665336753. The reversal of 665336749 is 947633566.

It is not a de Polignac number, because 665336749 - 2⁵ = 665336717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665336743) 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 11 ways as a sum of consecutive naturals, for example, 616657 + ... + 617734.

It is an arithmetic number, because the mean of its divisors is an integer number (70360344).

Almost surely, 2^665336749 is an apocalyptic number.

It is an amenable number.

665336749 is a deficient number, since it is larger than the sum of its proper divisors (178987379).

665336749 is a wasteful number, since it uses less digits than its factorization.

665336749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234416 (or 1234409 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 49.

The square root of 665336749 is about 25794.1223731299. The cubic root of 665336749 is about 872.9991829897. Note that the first 3 decimals are identical.

The spelling of 665336749 in words is "six hundred sixty-five million, three hundred thirty-six thousand, seven hundred forty-nine".