252443021616 has 120 divisors (see below), whose sum is σ = 732242585360. Its totient is φ = 81122093568.

The previous prime is 252443021573. The next prime is 252443021647. The reversal of 252443021616 is 616120344252.

252443021616 is a `hidden beast` number, since 2 + 5 + 2 + 4 + 4 + 30 + 2 + 1 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363411 + ... + 798093.

Almost surely, 2^252443021616 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 252443021616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366121292680).

252443021616 is an abundant number, since it is smaller than the sum of its proper divisors (479799563744).

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

252443021616 is a wasteful number, since it uses less digits than its factorization.

252443021616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434843 (or 434834 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 252443021616 its reverse (616120344252), we get a palindrome (868563365868).

The spelling of 252443021616 in words is "two hundred fifty-two billion, four hundred forty-three million, twenty-one thousand, six hundred sixteen".