642044546639 has 8 divisors (see below), whose sum is σ = 645267060000. Its totient is φ = 638830001152.

The previous prime is 642044546629. The next prime is 642044546659. The reversal of 642044546639 is 936645440246.

It is a happy number.

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 642044546639 - 2¹⁶ = 642044481103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642044546629) 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, 1830374 + ... + 2152755.

It is an arithmetic number, because the mean of its divisors is an integer number (80658382500).

Almost surely, 2^642044546639 is an apocalyptic number.

642044546639 is a deficient number, since it is larger than the sum of its proper divisors (3222513361).

642044546639 is a wasteful number, since it uses less digits than its factorization.

642044546639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983937.

The product of its (nonzero) digits is 14929920, while the sum is 53.

The spelling of 642044546639 in words is "six hundred forty-two billion, forty-four million, five hundred forty-six thousand, six hundred thirty-nine".