640163453 has 8 divisors (see below), whose sum is σ = 654539520. Its totient is φ = 625818960.

The previous prime is 640163449. The next prime is 640163467. The reversal of 640163453 is 354361046.

640163453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 640163453 - 2² = 640163449 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640163413) 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, 35783 + ... + 50603.

It is an arithmetic number, because the mean of its divisors is an integer number (81817440).

Almost surely, 2^640163453 is an apocalyptic number.

It is an amenable number.

640163453 is a deficient number, since it is larger than the sum of its proper divisors (14376067).

640163453 is a wasteful number, since it uses less digits than its factorization.

640163453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15787.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 640163453 is about 25301.4515986731. The cubic root of 640163453 is about 861.8472341041.

The spelling of 640163453 in words is "six hundred forty million, one hundred sixty-three thousand, four hundred fifty-three".