51505434435331 has 16 divisors (see below), whose sum is σ = 52689796440064. Its totient is φ = 50333357600064.

The previous prime is 51505434435223. The next prime is 51505434435361. The reversal of 51505434435331 is 13353443450515.

It is a cyclic number.

It is not a de Polignac number, because 51505434435331 - 2²¹ = 51505432338179 is a prime.

It is a super-2 number, since 2×51505434435331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51505434435361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114758146 + ... + 115206088.

It is an arithmetic number, because the mean of its divisors is an integer number (3293112277504).

Almost surely, 2^{51505434435331} is an apocalyptic number.

51505434435331 is a deficient number, since it is larger than the sum of its proper divisors (1184362004733).

51505434435331 is a wasteful number, since it uses less digits than its factorization.

51505434435331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461650.

The product of its (nonzero) digits is 3240000, while the sum is 46.

Adding to 51505434435331 its reverse (13353443450515), we get a palindrome (64858877885846).

The spelling of 51505434435331 in words is "fifty-one trillion, five hundred five billion, four hundred thirty-four million, four hundred thirty-five thousand, three hundred thirty-one".