1155111500020 has 96 divisors (see below), whose sum is σ = 2549797367040. Its totient is φ = 439060823040.

The previous prime is 1155111500017. The next prime is 1155111500027. The reversal of 1155111500020 is 200051115511.

It is a junction number, because it is equal to n+sod(n) for n = 1155111499964 and 1155111500000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155111500027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12612714 + ... + 12703966.

It is an arithmetic number, because the mean of its divisors is an integer number (26560389240).

Almost surely, 2^{1155111500020} is an apocalyptic number.

1155111500020 is a gapful number since it is divisible by the number (10) 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 1155111500020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1274898683520).

1155111500020 is an abundant number, since it is smaller than the sum of its proper divisors (1394685867020).

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

1155111500020 is a wasteful number, since it uses less digits than its factorization.

1155111500020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91705 (or 91703 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 22.

Adding to 1155111500020 its reverse (200051115511), we get a palindrome (1355162615531).

The spelling of 1155111500020 in words is "one trillion, one hundred fifty-five billion, one hundred eleven million, five hundred thousand, twenty".