640163451323 has 4 divisors (see below), whose sum is σ = 698360128728. Its totient is φ = 581966773920.

The previous prime is 640163451283. The next prime is 640163451329. The reversal of 640163451323 is 323154361046.

640163451323 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640163451323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640163451329) 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, 29098338686 + ... + 29098338707.

It is an arithmetic number, because the mean of its divisors is an integer number (174590032182).

Almost surely, 2^640163451323 is an apocalyptic number.

640163451323 is a deficient number, since it is larger than the sum of its proper divisors (58196677405).

640163451323 is a wasteful number, since it uses less digits than its factorization.

640163451323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58196677404.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 640163451323 in words is "six hundred forty billion, one hundred sixty-three million, four hundred fifty-one thousand, three hundred twenty-three".