51605001599 has 4 divisors (see below), whose sum is σ = 52106021136. Its totient is φ = 51103982064.

The previous prime is 51605001557. The next prime is 51605001619. The reversal of 51605001599 is 99510050615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51605001599 - 2¹⁶ = 51604936063 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 (51605001199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250509614 + ... + 250509819.

It is an arithmetic number, because the mean of its divisors is an integer number (13026505284).

Almost surely, 2^51605001599 is an apocalyptic number.

51605001599 is a deficient number, since it is larger than the sum of its proper divisors (501019537).

51605001599 is a wasteful number, since it uses less digits than its factorization.

51605001599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501019536.

The product of its (nonzero) digits is 60750, while the sum is 41.

The spelling of 51605001599 in words is "fifty-one billion, six hundred five million, one thousand, five hundred ninety-nine".