642842668542 has 16 divisors (see below), whose sum is σ = 1313040344832. Its totient is φ = 209721721560.

The previous prime is 642842668537. The next prime is 642842668547. The reversal of 642842668542 is 245866248246.

It is an interprime number because it is at equal distance from previous prime (642842668537) and next prime (642842668547).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642842668547) 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, 1139791684 + ... + 1139792247.

It is an arithmetic number, because the mean of its divisors is an integer number (82065021552).

Almost surely, 2^642842668542 is an apocalyptic number.

642842668542 is an abundant number, since it is smaller than the sum of its proper divisors (670197676290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642842668542 is a wasteful number, since it uses less digits than its factorization.

642842668542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279583983.

The product of its digits is 35389440, while the sum is 57.

The spelling of 642842668542 in words is "six hundred forty-two billion, eight hundred forty-two million, six hundred sixty-eight thousand, five hundred forty-two".