155111066100 has 144 divisors (see below), whose sum is σ = 500832875200. Its totient is φ = 41182162560.

The previous prime is 155111066059. The next prime is 155111066101. The reversal of 155111066100 is 1660111551.

155111066100 is a `hidden beast` number, since 1 + 551 + 1 + 1 + 0 + 6 + 6 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155111066101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 492867 + ... + 743733.

Almost surely, 2^155111066100 is an apocalyptic number.

155111066100 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 155111066100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250416437600).

155111066100 is an abundant number, since it is smaller than the sum of its proper divisors (345721809100).

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

155111066100 is a wasteful number, since it uses less digits than its factorization.

155111066100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251119 (or 251106 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

Adding to 155111066100 its reverse (1660111551), we get a palindrome (156771177651).

The spelling of 155111066100 in words is "one hundred fifty-five billion, one hundred eleven million, sixty-six thousand, one hundred".