51934395643 has 4 divisors (see below), whose sum is σ = 55929349168. Its totient is φ = 47939442120.

The previous prime is 51934395629. The next prime is 51934395671. The reversal of 51934395643 is 34659343915.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51934395643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51934395613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997476743 + ... + 1997476768.

It is an arithmetic number, because the mean of its divisors is an integer number (13982337292).

Almost surely, 2^51934395643 is an apocalyptic number.

51934395643 is a deficient number, since it is larger than the sum of its proper divisors (3994953525).

51934395643 is a wasteful number, since it uses less digits than its factorization.

51934395643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994953524.

The product of its digits is 5248800, while the sum is 52.

The spelling of 51934395643 in words is "fifty-one billion, nine hundred thirty-four million, three hundred ninety-five thousand, six hundred forty-three".