51999715801 has 4 divisors (see below), whose sum is σ = 56726962704. Its totient is φ = 47272468900.

The previous prime is 51999715799. The next prime is 51999715837. The reversal of 51999715801 is 10851799915.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51999715801 - 2¹ = 51999715799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51999715841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363623435 + ... + 2363623456.

It is an arithmetic number, because the mean of its divisors is an integer number (14181740676).

Almost surely, 2^51999715801 is an apocalyptic number.

It is an amenable number.

51999715801 is a deficient number, since it is larger than the sum of its proper divisors (4727246903).

51999715801 is a wasteful number, since it uses less digits than its factorization.

51999715801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727246902.

The product of its (nonzero) digits is 1020600, while the sum is 55.

The spelling of 51999715801 in words is "fifty-one billion, nine hundred ninety-nine million, seven hundred fifteen thousand, eight hundred one".