643123352140635 has 32 divisors (see below), whose sum is σ = 1029124311459840. Its totient is φ = 342956807308800.

The previous prime is 643123352140613. The next prime is 643123352140669. The reversal of 643123352140635 is 536041253321346.

It is a de Polignac number, because none of the positive numbers 2^k-643123352140635 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10086437155 + ... + 10086500915.

It is an arithmetic number, because the mean of its divisors is an integer number (32160134733120).

Almost surely, 2^{643123352140635} is an apocalyptic number.

643123352140635 is a deficient number, since it is larger than the sum of its proper divisors (386000959319205).

643123352140635 is a wasteful number, since it uses less digits than its factorization.

643123352140635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136179.

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 643123352140635 in words is "six hundred forty-three trillion, one hundred twenty-three billion, three hundred fifty-two million, one hundred forty thousand, six hundred thirty-five".