645151005 has 48 divisors (see below), whose sum is σ = 1139277360. Its totient is φ = 337665024.

The previous prime is 645150997. The next prime is 645151007. The reversal of 645151005 is 500151546.

It is a happy number.

645151005 is a `hidden beast` number, since 645 + 1 + 5 + 10 + 0 + 5 = 666.

645151005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 107931321 + 537219684 = 10389^2 + 23178^2 .

It is not a de Polignac number, because 645151005 - 2³ = 645150997 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645151005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645151007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 909591 + ... + 910299.

It is an arithmetic number, because the mean of its divisors is an integer number (23734945).

Almost surely, 2^645151005 is an apocalyptic number.

It is an amenable number.

645151005 is a deficient number, since it is larger than the sum of its proper divisors (494126355).

645151005 is a wasteful number, since it uses less digits than its factorization.

645151005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 645151005 is about 25399.8229324537. The cubic root of 645151005 is about 864.0796809551.

The spelling of 645151005 in words is "six hundred forty-five million, one hundred fifty-one thousand, five".