51706836665 has 8 divisors (see below), whose sum is σ = 67688949888. Its totient is φ = 37604972080.

The previous prime is 51706836661. The next prime is 51706836673. The reversal of 51706836665 is 56663860715.

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

It is not a de Polignac number, because 51706836665 - 2² = 51706836661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51706836661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470062097 + ... + 470062206.

It is an arithmetic number, because the mean of its divisors is an integer number (8461118736).

Almost surely, 2^51706836665 is an apocalyptic number.

51706836665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51706836665 is a deficient number, since it is larger than the sum of its proper divisors (15982113223).

51706836665 is a wasteful number, since it uses less digits than its factorization.

51706836665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940124319.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 51706836665 in words is "fifty-one billion, seven hundred six million, eight hundred thirty-six thousand, six hundred sixty-five".