643154535450403 has 4 divisors (see below), whose sum is σ = 643245005922480. Its totient is φ = 643064064978328.

The previous prime is 643154535450337. The next prime is 643154535450419. The reversal of 643154535450403 is 304054535451346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643154535450403 - 2³³ = 643145945515811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643154535450703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45235225375 + ... + 45235239592.

It is an arithmetic number, because the mean of its divisors is an integer number (160811251480620).

Almost surely, 2^{643154535450403} is an apocalyptic number.

643154535450403 is a deficient number, since it is larger than the sum of its proper divisors (90470472077).

643154535450403 is an equidigital number, since it uses as much as digits as its factorization.

643154535450403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90470472076.

The product of its (nonzero) digits is 25920000, while the sum is 52.

The spelling of 643154535450403 in words is "six hundred forty-three trillion, one hundred fifty-four billion, five hundred thirty-five million, four hundred fifty thousand, four hundred three".