51809363194 has 8 divisors (see below), whose sum is σ = 77718025440. Its totient is φ = 25903354716.

The previous prime is 51809363171. The next prime is 51809363213. The reversal of 51809363194 is 49136390815.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51809363194² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613894 + ... + 693169.

It is an arithmetic number, because the mean of its divisors is an integer number (9714753180).

Almost surely, 2^51809363194 is an apocalyptic number.

51809363194 is a deficient number, since it is larger than the sum of its proper divisors (25908662246).

51809363194 is a wasteful number, since it uses less digits than its factorization.

51809363194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326884.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 51809363194 in words is "fifty-one billion, eight hundred nine million, three hundred sixty-three thousand, one hundred ninety-four".