51701685703661 has 4 divisors (see below), whose sum is σ = 59087640804192. Its totient is φ = 44315730603132.

The previous prime is 51701685703643. The next prime is 51701685703669. The reversal of 51701685703661 is 16630758610715.

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 a de Polignac number, because none of the positive numbers 2^k-51701685703661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51701685703597 and 51701685703606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51701685703669) 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, 3692977550255 + ... + 3692977550268.

It is an arithmetic number, because the mean of its divisors is an integer number (14771910201048).

Almost surely, 2^{51701685703661} is an apocalyptic number.

It is an amenable number.

51701685703661 is a deficient number, since it is larger than the sum of its proper divisors (7385955100531).

51701685703661 is an equidigital number, since it uses as much as digits as its factorization.

51701685703661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7385955100530.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 51701685703661 in words is "fifty-one trillion, seven hundred one billion, six hundred eighty-five million, seven hundred three thousand, six hundred sixty-one".