51101105500 has 24 divisors (see below), whose sum is σ = 111604815504. Its totient is φ = 20440442000.

The previous prime is 51101105491. The next prime is 51101105509. The reversal of 51101105500 is 550110115.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51101105491) and next prime (51101105509).

It is a super-2 number, since 2×51101105500² (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 (51101105509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51100606 + ... + 51101605.

It is an arithmetic number, because the mean of its divisors is an integer number (4650200646).

Almost surely, 2^51101105500 is an apocalyptic number.

51101105500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51101105500 is an abundant number, since it is smaller than the sum of its proper divisors (60503710004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51101105500 is a wasteful number, since it uses less digits than its factorization.

51101105500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102202230 (or 102202218 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 19.

Adding to 51101105500 its reverse (550110115), we get a palindrome (51651215615).

The spelling of 51101105500 in words is "fifty-one billion, one hundred one million, one hundred five thousand, five hundred".