51665065599 has 8 divisors (see below), whose sum is σ = 78727719040. Its totient is φ = 29522894616.

The previous prime is 51665065567. The next prime is 51665065609. The reversal of 51665065599 is 99556056615.

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

It is not a de Polignac number, because 51665065599 - 2⁵ = 51665065567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665065519) 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, 1230120589 + ... + 1230120630.

It is an arithmetic number, because the mean of its divisors is an integer number (9840964880).

Almost surely, 2^51665065599 is an apocalyptic number.

51665065599 is a deficient number, since it is larger than the sum of its proper divisors (27062653441).

51665065599 is a wasteful number, since it uses less digits than its factorization.

51665065599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460241229.

The product of its (nonzero) digits is 10935000, while the sum is 57.

The spelling of 51665065599 in words is "fifty-one billion, six hundred sixty-five million, sixty-five thousand, five hundred ninety-nine".