640245425245 has 4 divisors (see below), whose sum is σ = 768294510300. Its totient is φ = 512196340192.

The previous prime is 640245425233. The next prime is 640245425297. The reversal of 640245425245 is 542524542046.

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 340409234916 + 299836190329 = 583446^2 + 547573^2 .

It is a cyclic number.

It is not a de Polignac number, because 640245425245 - 2¹¹ = 640245423197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64024542520 + ... + 64024542529.

It is an arithmetic number, because the mean of its divisors is an integer number (192073627575).

Almost surely, 2^640245425245 is an apocalyptic number.

It is an amenable number.

640245425245 is a deficient number, since it is larger than the sum of its proper divisors (128049085055).

640245425245 is a wasteful number, since it uses less digits than its factorization.

640245425245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128049085054.

The product of its (nonzero) digits is 1536000, while the sum is 43.

The spelling of 640245425245 in words is "six hundred forty billion, two hundred forty-five million, four hundred twenty-five thousand, two hundred forty-five".