51161232021543 has 48 divisors (see below), whose sum is σ = 88150280325120. Its totient is φ = 27957044408832.

The previous prime is 51161232021539. The next prime is 51161232021593. The reversal of 51161232021543 is 34512023216115.

51161232021543 is a `hidden beast` number, since 5 + 1 + 1 + 61 + 2 + 32 + 0 + 21 + 543 = 666.

It is not a de Polignac number, because 51161232021543 - 2² = 51161232021539 is a prime.

It is a super-2 number, since 2×51161232021543² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51161232021498 and 51161232021507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161232021593) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1582455 + ... + 10238487.

It is an arithmetic number, because the mean of its divisors is an integer number (1836464173440).

Almost surely, 2^{51161232021543} is an apocalyptic number.

51161232021543 is a deficient number, since it is larger than the sum of its proper divisors (36989048303577).

51161232021543 is a wasteful number, since it uses less digits than its factorization.

51161232021543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8660148 (or 8660145 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 51161232021543 its reverse (34512023216115), we get a palindrome (85673255237658).

The spelling of 51161232021543 in words is "fifty-one trillion, one hundred sixty-one billion, two hundred thirty-two million, twenty-one thousand, five hundred forty-three".