51685334340418 has 4 divisors (see below), whose sum is σ = 77528001510630. Its totient is φ = 25842667170208.

The previous prime is 51685334340397. The next prime is 51685334340503. The reversal of 51685334340418 is 81404343358615.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51666725833849 + 18608506569 = 7187957^2 + 136413^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12921333585103 + ... + 12921333585106.

Almost surely, 2^{51685334340418} is an apocalyptic number.

51685334340418 is a deficient number, since it is larger than the sum of its proper divisors (25842667170212).

51685334340418 is a wasteful number, since it uses less digits than its factorization.

51685334340418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25842667170211.

The product of its (nonzero) digits is 16588800, while the sum is 55.

The spelling of 51685334340418 in words is "fifty-one trillion, six hundred eighty-five billion, three hundred thirty-four million, three hundred forty thousand, four hundred eighteen".