5254468155821 has 4 divisors (see below), whose sum is σ = 5263328979612. Its totient is φ = 5245607332032.

The previous prime is 5254468155817. The next prime is 5254468155943. The reversal of 5254468155821 is 1285518644525.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3544163934025 + 1710304221796 = 1882595^2 + 1307786^2 .

It is a cyclic number.

It is not a de Polignac number, because 5254468155821 - 2² = 5254468155817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5254468175821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4430411006 + ... + 4430412191.

It is an arithmetic number, because the mean of its divisors is an integer number (1315832244903).

Almost surely, 2^{5254468155821} is an apocalyptic number.

It is an amenable number.

5254468155821 is a deficient number, since it is larger than the sum of its proper divisors (8860823791).

5254468155821 is an equidigital number, since it uses as much as digits as its factorization.

5254468155821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8860823790.

The product of its digits is 15360000, while the sum is 56.

The spelling of 5254468155821 in words is "five trillion, two hundred fifty-four billion, four hundred sixty-eight million, one hundred fifty-five thousand, eight hundred twenty-one".