51220832181 has 8 divisors (see below), whose sum is σ = 68309240544. Its totient is φ = 34139822640.

The previous prime is 51220832177. The next prime is 51220832191. The reversal of 51220832181 is 18123802215.

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

It is not a de Polignac number, because 51220832181 - 2² = 51220832177 is a prime.

It is a super-2 number, since 2×51220832181² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220832191) 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, 1833531 + ... + 1861256.

It is an arithmetic number, because the mean of its divisors is an integer number (8538655068).

Almost surely, 2^51220832181 is an apocalyptic number.

It is an amenable number.

51220832181 is a deficient number, since it is larger than the sum of its proper divisors (17088408363).

51220832181 is a wasteful number, since it uses less digits than its factorization.

51220832181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699411.

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 51220832181 in words is "fifty-one billion, two hundred twenty million, eight hundred thirty-two thousand, one hundred eighty-one".