2011151550520 has 128 divisors (see below), whose sum is σ = 5247686793600. Its totient is φ = 679402930176.

The previous prime is 2011151550493. The next prime is 2011151550521. The reversal of 2011151550520 is 250551511102.

It is a super-2 number, since 2×2011151550520² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011151550521) 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, 20329336 + ... + 20428024.

It is an arithmetic number, because the mean of its divisors is an integer number (40997553075).

Almost surely, 2^{2011151550520} is an apocalyptic number.

2011151550520 is a gapful number since it is divisible by the number (20) 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 2011151550520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2623843396800).

2011151550520 is an abundant number, since it is smaller than the sum of its proper divisors (3236535243080).

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

2011151550520 is a wasteful number, since it uses less digits than its factorization.

2011151550520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99777 (or 99773 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 28.

The spelling of 2011151550520 in words is "two trillion, eleven billion, one hundred fifty-one million, five hundred fifty thousand, five hundred twenty".