642452165620 has 96 divisors (see below), whose sum is σ = 1433877355008. Its totient is φ = 240957253632.

The previous prime is 642452165599. The next prime is 642452165633. The reversal of 642452165620 is 26561254246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160090734 + ... + 160094746.

It is an arithmetic number, because the mean of its divisors is an integer number (14936222448).

Almost surely, 2^642452165620 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 642452165620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (716938677504).

642452165620 is an abundant number, since it is smaller than the sum of its proper divisors (791425189388).

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

642452165620 is a wasteful number, since it uses less digits than its factorization.

642452165620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5689 (or 5687 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 642452165620 in words is "six hundred forty-two billion, four hundred fifty-two million, one hundred sixty-five thousand, six hundred twenty".