645336873130 has 16 divisors (see below), whose sum is σ = 1161657244584. Its totient is φ = 258123444160.

The previous prime is 645336873089. The next prime is 645336873131. The reversal of 645336873130 is 31378633546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 537800755801 + 107536117329 = 733349^2 + 327927^2 .

It is not an unprimeable number, because it can be changed into a prime (645336873131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1171417 + ... + 1631836.

Almost surely, 2^645336873130 is an apocalyptic number.

645336873130 is a deficient number, since it is larger than the sum of its proper divisors (516320371454).

645336873130 is a wasteful number, since it uses less digits than its factorization.

645336873130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826281.

The product of its (nonzero) digits is 3265920, while the sum is 49.

The spelling of 645336873130 in words is "six hundred forty-five billion, three hundred thirty-six million, eight hundred seventy-three thousand, one hundred thirty".