51604635553 has 4 divisors (see below), whose sum is σ = 53269301248. Its totient is φ = 49939969860.

The previous prime is 51604635517. The next prime is 51604635559. The reversal of 51604635553 is 35553640615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51604635553 - 2¹⁷ = 51604504481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51604635559) 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, 832332801 + ... + 832332862.

It is an arithmetic number, because the mean of its divisors is an integer number (13317325312).

Almost surely, 2^51604635553 is an apocalyptic number.

It is an amenable number.

51604635553 is a deficient number, since it is larger than the sum of its proper divisors (1664665695).

51604635553 is a wasteful number, since it uses less digits than its factorization.

51604635553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664665694.

The product of its (nonzero) digits is 810000, while the sum is 43.

The spelling of 51604635553 in words is "fifty-one billion, six hundred four million, six hundred thirty-five thousand, five hundred fifty-three".