51111532123500 has 192 divisors, whose sum is σ = 150393677930496. Its totient is φ = 13487318560000.

The previous prime is 51111532123471. The next prime is 51111532123511. The reversal of 51111532123500 is 532123511115.

It is a super-2 number, since 2×51111532123500² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 276091969 + ... + 276277031.

It is an arithmetic number, because the mean of its divisors is an integer number (783300405888).

Almost surely, 2^{51111532123500} is an apocalyptic number.

51111532123500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51111532123500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75196838965248).

51111532123500 is an abundant number, since it is smaller than the sum of its proper divisors (99282145806996).

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

51111532123500 is a wasteful number, since it uses less digits than its factorization.

51111532123500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187009 (or 186997 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

Adding to 51111532123500 its reverse (532123511115), we get a palindrome (51643655634615).

The spelling of 51111532123500 in words is "fifty-one trillion, one hundred eleven billion, five hundred thirty-two million, one hundred twenty-three thousand, five hundred".