51802209665 has 16 divisors (see below), whose sum is σ = 63257426496. Its totient is φ = 40718184000.

The previous prime is 51802209659. The next prime is 51802209671. The reversal of 51802209665 is 56690220815.

It is an interprime number because it is at equal distance from previous prime (51802209659) and next prime (51802209671).

It is not a de Polignac number, because 51802209665 - 2⁸ = 51802209409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325367 + ... + 457676.

It is an arithmetic number, because the mean of its divisors is an integer number (3953589156).

Almost surely, 2^51802209665 is an apocalyptic number.

It is an amenable number.

51802209665 is a deficient number, since it is larger than the sum of its proper divisors (11455216831).

51802209665 is a wasteful number, since it uses less digits than its factorization.

51802209665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783280.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 51802209665 in words is "fifty-one billion, eight hundred two million, two hundred nine thousand, six hundred sixty-five".