51681898950019 has 24 divisors (see below), whose sum is σ = 57104770121280. Its totient is φ = 46495971723264.

The previous prime is 51681898949999. The next prime is 51681898950061. The reversal of 51681898950019 is 91005989818615.

It is not a de Polignac number, because 51681898950019 - 2⁵ = 51681898949987 is a prime.

It is a super-2 number, since 2×51681898950019² (a number of 28 digits) contains 22 as substring.

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 51681898950019.

It is not an unprimeable number, because it can be changed into a prime (51681898950089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3098307 + ... + 10628419.

It is an arithmetic number, because the mean of its divisors is an integer number (2379365421720).

Almost surely, 2^{51681898950019} is an apocalyptic number.

51681898950019 is a deficient number, since it is larger than the sum of its proper divisors (5422871171261).

51681898950019 is a wasteful number, since it uses less digits than its factorization.

51681898950019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7530459 (or 7530412 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 70.

The spelling of 51681898950019 in words is "fifty-one trillion, six hundred eighty-one billion, eight hundred ninety-eight million, nine hundred fifty thousand, nineteen".