54251645521 has 8 divisors (see below), whose sum is σ = 54496559720. Its totient is φ = 54006801408.

The previous prime is 54251645501. The next prime is 54251645527. The reversal of 54251645521 is 12554615245.

It can be written as a sum of positive squares in 4 ways, for example, as 43875167296 + 10376478225 = 209464^2 + 101865^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 54251645521 - 2¹³ = 54251637329 is a prime.

It is a super-2 number, since 2×54251645521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54251645527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2111665 + ... + 2137201.

It is an arithmetic number, because the mean of its divisors is an integer number (6812069965).

Almost surely, 2^54251645521 is an apocalyptic number.

It is an amenable number.

54251645521 is a deficient number, since it is larger than the sum of its proper divisors (244914199).

54251645521 is a wasteful number, since it uses less digits than its factorization.

54251645521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35043.

The product of its digits is 240000, while the sum is 40.

The spelling of 54251645521 in words is "fifty-four billion, two hundred fifty-one million, six hundred forty-five thousand, five hundred twenty-one".