51780236180181 has 16 divisors (see below), whose sum is σ = 73116329131584. Its totient is φ = 32482973631744.

The previous prime is 51780236180107. The next prime is 51780236180209. The reversal of 51780236180181 is 18108163208715.

It is a happy number.

51780236180181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51780236180181 - 2⁹ = 51780236179669 is a prime.

It is a super-2 number, since 2×51780236180181² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51780236181181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102657271 + ... + 103160436.

It is an arithmetic number, because the mean of its divisors is an integer number (4569770570724).

Almost surely, 2^{51780236180181} is an apocalyptic number.

51780236180181 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51780236180181 is a deficient number, since it is larger than the sum of its proper divisors (21336092951403).

51780236180181 is a wasteful number, since it uses less digits than its factorization.

51780236180181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205822660.

The product of its (nonzero) digits is 645120, while the sum is 51.

Adding to 51780236180181 its reverse (18108163208715), we get a palindrome (69888399388896).

The spelling of 51780236180181 in words is "fifty-one trillion, seven hundred eighty billion, two hundred thirty-six million, one hundred eighty thousand, one hundred eighty-one".