51105003553 has 4 divisors (see below), whose sum is σ = 51105530560. Its totient is φ = 51104476548.

The previous prime is 51105003539. The next prime is 51105003557. The reversal of 51105003553 is 35530050115.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51105003553 - 2²¹ = 51102906401 is a prime.

It is a super-2 number, since 2×51105003553² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51105003557) 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, 71325 + ... + 327562.

It is an arithmetic number, because the mean of its divisors is an integer number (12776382640).

Almost surely, 2^51105003553 is an apocalyptic number.

It is an amenable number.

51105003553 is a deficient number, since it is larger than the sum of its proper divisors (527007).

51105003553 is a wasteful number, since it uses less digits than its factorization.

51105003553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527006.

The product of its (nonzero) digits is 5625, while the sum is 28.

Adding to 51105003553 its reverse (35530050115), we get a palindrome (86635053668).

The spelling of 51105003553 in words is "fifty-one billion, one hundred five million, three thousand, five hundred fifty-three".