2155775512 has 64 divisors (see below), whose sum is σ = 4529779200. Its totient is φ = 953520000.

The previous prime is 2155775471. The next prime is 2155775551.

It is a happy number.

2155775512 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522337 + ... + 526447.

It is an arithmetic number, because the mean of its divisors is an integer number (70777800).

Almost surely, 2^2155775512 is an apocalyptic number.

2155775512 is a gapful number since it is divisible by the number (22) 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 2155775512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2264889600).

2155775512 is an abundant number, since it is smaller than the sum of its proper divisors (2374003688).

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

2155775512 is a wasteful number, since it uses less digits than its factorization.

2155775512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288 (or 4284 counting only the distinct ones).

The product of its digits is 122500, while the sum is 40.

The square root of 2155775512 is about 46430.3296563787. The cubic root of 2155775512 is about 1291.8175433349.

The spelling of 2155775512 in words is "two billion, one hundred fifty-five million, seven hundred seventy-five thousand, five hundred twelve".