640350308427 has 8 divisors (see below), whose sum is σ = 853822703616. Its totient is φ = 426889059432.

The previous prime is 640350308419. The next prime is 640350308443. The reversal of 640350308427 is 724803053046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640350308427 - 2³ = 640350308419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640350308027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2651563 + ... + 2882964.

It is an arithmetic number, because the mean of its divisors is an integer number (106727837952).

Almost surely, 2^640350308427 is an apocalyptic number.

640350308427 is a deficient number, since it is larger than the sum of its proper divisors (213472395189).

640350308427 is a wasteful number, since it uses less digits than its factorization.

640350308427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5573097.

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 640350308427 in words is "six hundred forty billion, three hundred fifty million, three hundred eight thousand, four hundred twenty-seven".