51856801699 has 4 divisors (see below), whose sum is σ = 51857290800. Its totient is φ = 51856312600.

The previous prime is 51856801679. The next prime is 51856801723. The reversal of 51856801699 is 99610865815.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51856801699 - 2¹³ = 51856793507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51856801679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11452 + ... + 322249.

It is an arithmetic number, because the mean of its divisors is an integer number (12964322700).

Almost surely, 2^51856801699 is an apocalyptic number.

51856801699 is a deficient number, since it is larger than the sum of its proper divisors (489101).

51856801699 is a wasteful number, since it uses less digits than its factorization.

51856801699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489100.

The product of its (nonzero) digits is 4665600, while the sum is 58.

The spelling of 51856801699 in words is "fifty-one billion, eight hundred fifty-six million, eight hundred one thousand, six hundred ninety-nine".