51999999999902 has 32 divisors (see below), whose sum is σ = 86938612912800. Its totient is φ = 23181694967808.

The previous prime is 51999999999869. The next prime is 51999999999943. The reversal of 51999999999902 is 20999999999915.

It is a self number, because there is not a number n which added to its sum of digits gives 51999999999902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13922174 + ... + 17257662.

It is an arithmetic number, because the mean of its divisors is an integer number (2716831653525).

Almost surely, 2^{51999999999902} is an apocalyptic number.

51999999999902 is a deficient number, since it is larger than the sum of its proper divisors (34938612912898).

51999999999902 is a wasteful number, since it uses less digits than its factorization.

51999999999902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3359660.

The product of its (nonzero) digits is 34867844010, while the sum is 98.

The spelling of 51999999999902 in words is "fifty-one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred two".