664145361 has 24 divisors (see below), whose sum is σ = 1101615840. Its totient is φ = 381326400.

The previous prime is 664145353. The next prime is 664145371. The reversal of 664145361 is 163541466.

It is a happy number.

664145361 is a `hidden beast` number, since 6 + 641 + 4 + 5 + 3 + 6 + 1 = 666.

664145361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664145361 - 2³ = 664145353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664145371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174660 + ... + 178421.

It is an arithmetic number, because the mean of its divisors is an integer number (45900660).

Almost surely, 2^664145361 is an apocalyptic number.

It is an amenable number.

664145361 is a deficient number, since it is larger than the sum of its proper divisors (437470479).

664145361 is a wasteful number, since it uses less digits than its factorization.

664145361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353117 (or 353114 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 664145361 is about 25771.0178495146. The cubic root of 664145361 is about 872.4777917900.

The spelling of 664145361 in words is "six hundred sixty-four million, one hundred forty-five thousand, three hundred sixty-one".