51155352520521 has 8 divisors (see below), whose sum is σ = 68241463393824. Its totient is φ = 34086404997120.

The previous prime is 51155352520499. The next prime is 51155352520577. The reversal of 51155352520521 is 12502525355115.

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

It is not a de Polignac number, because 51155352520521 - 2²¹ = 51155350423369 is a prime.

It is a super-2 number, since 2×51155352520521² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51155352520621) 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, 4290830520 + ... + 4290842441.

It is an arithmetic number, because the mean of its divisors is an integer number (8530182924228).

Almost surely, 2^{51155352520521} is an apocalyptic number.

It is an amenable number.

51155352520521 is a deficient number, since it is larger than the sum of its proper divisors (17086110873303).

51155352520521 is a wasteful number, since it uses less digits than its factorization.

51155352520521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8581674951.

The product of its (nonzero) digits is 375000, while the sum is 42.

Adding to 51155352520521 its reverse (12502525355115), we get a palindrome (63657877875636).

The spelling of 51155352520521 in words is "fifty-one trillion, one hundred fifty-five billion, three hundred fifty-two million, five hundred twenty thousand, five hundred twenty-one".