51413542355521 has 8 divisors (see below), whose sum is σ = 54440301104424. Its totient is φ = 48387053909760.

The previous prime is 51413542355437. The next prime is 51413542355537. The reversal of 51413542355521 is 12555324531415.

It can be written as a sum of positive squares in 4 ways, for example, as 4415730660496 + 46997811695025 = 2101364^2 + 6855495^2 .

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 51413542355521 - 2⁹ = 51413542355009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51413542355551) 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, 67184110 + ... + 67945063.

It is an arithmetic number, because the mean of its divisors is an integer number (6805037638053).

Almost surely, 2^{51413542355521} is an apocalyptic number.

It is an amenable number.

51413542355521 is a deficient number, since it is larger than the sum of its proper divisors (3026758748903).

51413542355521 is a wasteful number, since it uses less digits than its factorization.

51413542355521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135151571.

The product of its digits is 1800000, while the sum is 46.

Adding to 51413542355521 its reverse (12555324531415), we get a palindrome (63968866886936).

The spelling of 51413542355521 in words is "fifty-one trillion, four hundred thirteen billion, five hundred forty-two million, three hundred fifty-five thousand, five hundred twenty-one".