665350645 has 32 divisors (see below), whose sum is σ = 858574080. Its totient is φ = 493516800.

The previous prime is 665350643. The next prime is 665350649. The reversal of 665350645 is 546053566.

It is a happy number.

It is not a de Polignac number, because 665350645 - 2¹ = 665350643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665350598 and 665350607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665350643) 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 31 ways as a sum of consecutive naturals, for example, 948795 + ... + 949495.

It is an arithmetic number, because the mean of its divisors is an integer number (26830440).

Almost surely, 2^665350645 is an apocalyptic number.

It is an amenable number.

665350645 is a deficient number, since it is larger than the sum of its proper divisors (193223435).

665350645 is a wasteful number, since it uses less digits than its factorization.

665350645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925.

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 665350645 is about 25794.3917354141. The cubic root of 665350645 is about 873.0052606700.

The spelling of 665350645 in words is "six hundred sixty-five million, three hundred fifty thousand, six hundred forty-five".