643253563435 has 16 divisors (see below), whose sum is σ = 887795280576. Its totient is φ = 438278675328.

The previous prime is 643253563429. The next prime is 643253563441. The reversal of 643253563435 is 534365352346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (643253563429) and next prime (643253563441).

It is a cyclic number.

It is not a de Polignac number, because 643253563435 - 2⁷ = 643253563307 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 58525312 + ... + 58536301.

It is an arithmetic number, because the mean of its divisors is an integer number (55487205036).

Almost surely, 2^643253563435 is an apocalyptic number.

643253563435 is a deficient number, since it is larger than the sum of its proper divisors (244541717141).

643253563435 is a wasteful number, since it uses less digits than its factorization.

643253563435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117061782.

The product of its digits is 11664000, while the sum is 49.

The spelling of 643253563435 in words is "six hundred forty-three billion, two hundred fifty-three million, five hundred sixty-three thousand, four hundred thirty-five".