642755840783 has 8 divisors (see below), whose sum is σ = 766516282368. Its totient is φ = 526979943864.

The previous prime is 642755840743. The next prime is 642755840897. The reversal of 642755840783 is 387048557246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642755840783 - 2²² = 642751646479 is a prime.

It is a super-2 number, since 2×642755840783² (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 (642755840743) 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 7 ways as a sum of consecutive naturals, for example, 1996135991 + ... + 1996136312.

It is an arithmetic number, because the mean of its divisors is an integer number (95814535296).

Almost surely, 2^642755840783 is an apocalyptic number.

642755840783 is a deficient number, since it is larger than the sum of its proper divisors (123760441585).

642755840783 is a wasteful number, since it uses less digits than its factorization.

642755840783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3992272333.

The product of its (nonzero) digits is 45158400, while the sum is 59.

The spelling of 642755840783 in words is "six hundred forty-two billion, seven hundred fifty-five million, eight hundred forty thousand, seven hundred eighty-three".