645150005 has 4 divisors (see below), whose sum is σ = 774180012. Its totient is φ = 516120000.

The previous prime is 645150001. The next prime is 645150029. The reversal of 645150005 is 500051546.

645150005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500051546 = 2 ⋅250025773.

It can be written as a sum of positive squares in 2 ways, for example, as 237190801 + 407959204 = 15401^2 + 20198^2 .

It is not a de Polignac number, because 645150005 - 2² = 645150001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645150001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64514996 + ... + 64515005.

It is an arithmetic number, because the mean of its divisors is an integer number (193545003).

Almost surely, 2^645150005 is an apocalyptic number.

It is an amenable number.

645150005 is a deficient number, since it is larger than the sum of its proper divisors (129030007).

645150005 is a wasteful number, since it uses less digits than its factorization.

645150005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129030006.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 645150005 is about 25399.8032472695. The cubic root of 645150005 is about 864.0792345066.

The spelling of 645150005 in words is "six hundred forty-five million, one hundred fifty thousand, five".