51993963665 has 8 divisors (see below), whose sum is σ = 71306007360. Its totient is φ = 35653003632.

The previous prime is 51993963649. The next prime is 51993963673. The reversal of 51993963665 is 56636939915.

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

It is a cyclic number.

It is not a de Polignac number, because 51993963665 - 2⁴ = 51993963649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51993963598 and 51993963607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 742770875 + ... + 742770944.

It is an arithmetic number, because the mean of its divisors is an integer number (8913250920).

Almost surely, 2^51993963665 is an apocalyptic number.

It is an amenable number.

51993963665 is a deficient number, since it is larger than the sum of its proper divisors (19312043695).

51993963665 is a wasteful number, since it uses less digits than its factorization.

51993963665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485541831.

The product of its digits is 35429400, while the sum is 62.

The spelling of 51993963665 in words is "fifty-one billion, nine hundred ninety-three million, nine hundred sixty-three thousand, six hundred sixty-five".