51683216181 has 8 divisors (see below), whose sum is σ = 68912005824. Its totient is φ = 34454952000.

The previous prime is 51683216173. The next prime is 51683216191. The reversal of 51683216181 is 18161238615.

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

It is not a de Polignac number, because 51683216181 - 2³ = 51683216173 is a prime.

It is a super-2 number, since 2×51683216181² (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 (51683216141) 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, 309640 + ... + 446366.

It is an arithmetic number, because the mean of its divisors is an integer number (8614000728).

Almost surely, 2^51683216181 is an apocalyptic number.

It is an amenable number.

51683216181 is a deficient number, since it is larger than the sum of its proper divisors (17228789643).

51683216181 is a wasteful number, since it uses less digits than its factorization.

51683216181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262731.

The product of its digits is 69120, while the sum is 42.

The spelling of 51683216181 in words is "fifty-one billion, six hundred eighty-three million, two hundred sixteen thousand, one hundred eighty-one".