2155571712 has 240 divisors, whose sum is σ = 7530000192. Its totient is φ = 579502080.

The previous prime is 2155571699. The next prime is 2155571741. The reversal of 2155571712 is 2171755512.

2155571712 is a `hidden beast` number, since 2 + 15 + 5 + 571 + 71 + 2 = 666.

It is a super-2 number, since 2×2155571712² = 9292978811149221888, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 546387 + ... + 550317.

Almost surely, 2^2155571712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155571712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3765000096).

2155571712 is an abundant number, since it is smaller than the sum of its proper divisors (5374428480).

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

2155571712 is a wasteful number, since it uses less digits than its factorization.

2155571712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3979 (or 3960 counting only the distinct ones).

The product of its digits is 24500, while the sum is 36.

The square root of 2155571712 is about 46428.1349183876. The cubic root of 2155571712 is about 1291.7768339768.

The spelling of 2155571712 in words is "two billion, one hundred fifty-five million, five hundred seventy-one thousand, seven hundred twelve".