643602453 has 16 divisors (see below), whose sum is σ = 924643776. Its totient is φ = 395850240.

The previous prime is 643602419. The next prime is 643602467. The reversal of 643602453 is 354206346.

It is not a de Polignac number, because 643602453 - 2⁶ = 643602389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643602413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100518 + ... + 106728.

It is an arithmetic number, because the mean of its divisors is an integer number (57790236).

Almost surely, 2^643602453 is an apocalyptic number.

It is an amenable number.

643602453 is a deficient number, since it is larger than the sum of its proper divisors (281041323).

643602453 is a wasteful number, since it uses less digits than its factorization.

643602453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8884.

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 643602453 is about 25369.3210985237. The cubic root of 643602453 is about 863.3877786839.

Adding to 643602453 its reverse (354206346), we get a palindrome (997808799).

The spelling of 643602453 in words is "six hundred forty-three million, six hundred two thousand, four hundred fifty-three".