252401554521 has 8 divisors (see below), whose sum is σ = 373928228960. Its totient is φ = 168267702996.

The previous prime is 252401554519. The next prime is 252401554541. The reversal of 252401554521 is 125455104252.

252401554521 is a `hidden beast` number, since 2 + 52 + 4 + 0 + 1 + 554 + 52 + 1 = 666.

It is not a de Polignac number, because 252401554521 - 2¹ = 252401554519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252401554511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4674102835 + ... + 4674102888.

It is an arithmetic number, because the mean of its divisors is an integer number (46741028620).

Almost surely, 2^252401554521 is an apocalyptic number.

It is an amenable number.

252401554521 is a deficient number, since it is larger than the sum of its proper divisors (121526674439).

252401554521 is an equidigital number, since it uses as much as digits as its factorization.

252401554521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348205732 (or 9348205726 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

Adding to 252401554521 its reverse (125455104252), we get a palindrome (377856658773).

The spelling of 252401554521 in words is "two hundred fifty-two billion, four hundred one million, five hundred fifty-four thousand, five hundred twenty-one".