51703201681 has 4 divisors (see below), whose sum is σ = 51973899264. Its totient is φ = 51432504100.

The previous prime is 51703201663. The next prime is 51703201691. The reversal of 51703201681 is 18610230715.

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 51703201681 - 2¹¹ = 51703199633 is a prime.

It is a super-2 number, since 2×51703201681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51703201621) 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, 135348505 + ... + 135348886.

It is an arithmetic number, because the mean of its divisors is an integer number (12993474816).

Almost surely, 2^51703201681 is an apocalyptic number.

It is an amenable number.

51703201681 is a deficient number, since it is larger than the sum of its proper divisors (270697583).

51703201681 is a wasteful number, since it uses less digits than its factorization.

51703201681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270697582.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 51703201681 in words is "fifty-one billion, seven hundred three million, two hundred one thousand, six hundred eighty-one".