642105843269 has 16 divisors (see below), whose sum is σ = 741984929856. Its totient is φ = 549172281600.

The previous prime is 642105843263. The next prime is 642105843283. The reversal of 642105843269 is 962348501246.

It is a cyclic number.

It is not a de Polignac number, because 642105843269 - 2³⁶ = 573386366533 is a prime.

It is a super-2 number, since 2×642105843269² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642105843263) by changing a digit.

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, 234602 + ... + 1157259.

It is an arithmetic number, because the mean of its divisors is an integer number (46374058116).

Almost surely, 2^642105843269 is an apocalyptic number.

It is an amenable number.

642105843269 is a deficient number, since it is larger than the sum of its proper divisors (99879086587).

642105843269 is a wasteful number, since it uses less digits than its factorization.

642105843269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394356.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 642105843269 in words is "six hundred forty-two billion, one hundred five million, eight hundred forty-three thousand, two hundred sixty-nine".