2011551102 has 144 divisors (see below), whose sum is σ = 5033390544. Its totient is φ = 575424000.

The previous prime is 2011551049. The next prime is 2011551127.

2011551102 is a `hidden beast` number, since 2 + 0 + 11 + 551 + 102 = 666.

2011551102 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11113452 + ... + 11113632.

It is an arithmetic number, because the mean of its divisors is an integer number (34954101).

Almost surely, 2^2011551102 is an apocalyptic number.

2011551102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2011551102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2516695272).

2011551102 is an abundant number, since it is smaller than the sum of its proper divisors (3021839442).

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

2011551102 is a wasteful number, since it uses less digits than its factorization.

2011551102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 2011551102 is about 44850.3188617428. The cubic root of 2011551102 is about 1262.3419745614.

It can be divided in two parts, 20115 and 51102, that added together give a palindrome (71217).

The spelling of 2011551102 in words is "two billion, eleven million, five hundred fifty-one thousand, one hundred two".