642989381056 has 112 divisors (see below), whose sum is σ = 1474801378560. Its totient is φ = 274889502720.

The previous prime is 642989381053. The next prime is 642989381059. The reversal of 642989381056 is 650183989246.

It is an interprime number because it is at equal distance from previous prime (642989381053) and next prime (642989381059).

It is a junction number, because it is equal to n+sod(n) for n = 642989380985 and 642989381003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642989381053) 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, 18449215 + ... + 18484033.

Almost surely, 2^642989381056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642989381056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (737400689280).

642989381056 is an abundant number, since it is smaller than the sum of its proper divisors (831811997504).

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

642989381056 is a wasteful number, since it uses less digits than its factorization.

642989381056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36402 (or 36392 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 642989381056 in words is "six hundred forty-two billion, nine hundred eighty-nine million, three hundred eighty-one thousand, fifty-six".