51685633999 has 8 divisors (see below), whose sum is σ = 53118154080. Its totient is φ = 50254988256.

The previous prime is 51685633997. The next prime is 51685634003. The reversal of 51685633999 is 99933658615.

51685633999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51685633999 - 2¹ = 51685633997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51685633999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51685633997) 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, 412579 + ... + 523060.

It is an arithmetic number, because the mean of its divisors is an integer number (6639769260).

Almost surely, 2^51685633999 is an apocalyptic number.

51685633999 is a deficient number, since it is larger than the sum of its proper divisors (1432520081).

51685633999 is a wasteful number, since it uses less digits than its factorization.

51685633999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937169.

The product of its digits is 47239200, while the sum is 64.

The spelling of 51685633999 in words is "fifty-one billion, six hundred eighty-five million, six hundred thirty-three thousand, nine hundred ninety-nine".