640152240300745 has 4 divisors (see below), whose sum is σ = 768182688360900. Its totient is φ = 512121792240592.

The previous prime is 640152240300743. The next prime is 640152240300751. The reversal of 640152240300745 is 547003042251046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 492027105075856 + 148125135224889 = 22181684^2 + 12170667^2 .

It is a cyclic number.

It is not a de Polignac number, because 640152240300745 - 2¹ = 640152240300743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640152240300743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64015224030070 + ... + 64015224030079.

It is an arithmetic number, because the mean of its divisors is an integer number (192045672090225).

Almost surely, 2^{640152240300745} is an apocalyptic number.

It is an amenable number.

640152240300745 is a deficient number, since it is larger than the sum of its proper divisors (128030448060155).

640152240300745 is a wasteful number, since it uses less digits than its factorization.

640152240300745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128030448060154.

The product of its (nonzero) digits is 806400, while the sum is 43.

The spelling of 640152240300745 in words is "six hundred forty trillion, one hundred fifty-two billion, two hundred forty million, three hundred thousand, seven hundred forty-five".