51001105611111 has 4 divisors (see below), whose sum is σ = 68001474148152. Its totient is φ = 34000737074072.

The previous prime is 51001105611101. The next prime is 51001105611119. The reversal of 51001105611111 is 11111650110015.

It is a happy number.

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 51001105611111 - 2¹⁰ = 51001105610087 is a prime.

It is a super-2 number, since 2×51001105611111² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51001105611119) 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, 8500184268516 + ... + 8500184268521.

It is an arithmetic number, because the mean of its divisors is an integer number (17000368537038).

Almost surely, 2^{51001105611111} is an apocalyptic number.

51001105611111 is a deficient number, since it is larger than the sum of its proper divisors (17000368537041).

51001105611111 is a wasteful number, since it uses less digits than its factorization.

51001105611111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17000368537040.

The product of its (nonzero) digits is 150, while the sum is 24.

Adding to 51001105611111 its reverse (11111650110015), we get a palindrome (62112755721126).

The spelling of 51001105611111 in words is "fifty-one trillion, one billion, one hundred five million, six hundred eleven thousand, one hundred eleven".