51943920849 has 36 divisors (see below), whose sum is σ = 80108438800. Its totient is φ = 32344084080.

The previous prime is 51943920841. The next prime is 51943920851. The reversal of 51943920849 is 94802934915.

51943920849 is a `hidden beast` number, since 519 + 43 + 9 + 2 + 0 + 84 + 9 = 666.

It is not a de Polignac number, because 51943920849 - 2³ = 51943920841 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51943920795 and 51943920804.

It is not an unprimeable number, because it can be changed into a prime (51943920841) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 831882 + ... + 892140.

Almost surely, 2^51943920849 is an apocalyptic number.

It is an amenable number.

51943920849 is a deficient number, since it is larger than the sum of its proper divisors (28164517951).

51943920849 is a wasteful number, since it uses less digits than its factorization.

51943920849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60426 (or 60352 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The spelling of 51943920849 in words is "fifty-one billion, nine hundred forty-three million, nine hundred twenty thousand, eight hundred forty-nine".