51999999999893 has 16 divisors (see below), whose sum is σ = 57347620601856. Its totient is φ = 46756886059440.

The previous prime is 51999999999869. The next prime is 51999999999943. The reversal of 51999999999893 is 39899999999915.

It is a cyclic number.

It is not a de Polignac number, because 51999999999893 - 2¹⁶ = 51999999934357 is a prime.

It is a super-2 number, since 2×51999999999893² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51999999599893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26950805 + ... + 28815722.

It is an arithmetic number, because the mean of its divisors is an integer number (3584226287616).

Almost surely, 2^{51999999999893} is an apocalyptic number.

It is an amenable number.

51999999999893 is a deficient number, since it is larger than the sum of its proper divisors (5347620601963).

51999999999893 is a wasteful number, since it uses less digits than its factorization.

51999999999893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55767464.

The product of its digits is 418414128120, while the sum is 107.

The spelling of 51999999999893 in words is "fifty-one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred ninety-three".