51111056013 has 4 divisors (see below), whose sum is σ = 68148074688. Its totient is φ = 34074037340.

The previous prime is 51111056011. The next prime is 51111056027. The reversal of 51111056013 is 31065011115.

It is a happy number.

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 51111056013 - 2¹ = 51111056011 is a prime.

It is a super-2 number, since 2×51111056013² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111056011) 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, 8518509333 + ... + 8518509338.

It is an arithmetic number, because the mean of its divisors is an integer number (17037018672).

Almost surely, 2^51111056013 is an apocalyptic number.

It is an amenable number.

51111056013 is a deficient number, since it is larger than the sum of its proper divisors (17037018675).

51111056013 is a wasteful number, since it uses less digits than its factorization.

51111056013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17037018674.

The product of its (nonzero) digits is 450, while the sum is 24.

Adding to 51111056013 its reverse (31065011115), we get a palindrome (82176067128).

The spelling of 51111056013 in words is "fifty-one billion, one hundred eleven million, fifty-six thousand, thirteen".