2155666512 has 160 divisors (see below), whose sum is σ = 5973367680. Its totient is φ = 668631040.

The previous prime is 2155666501. The next prime is 2155666523. The reversal of 2155666512 is 2156665512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2155666501) and next prime (2155666523).

It is a super-2 number, since 2×2155666512² = 9293796221916492288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6106528 + ... + 6106880.

It is an arithmetic number, because the mean of its divisors is an integer number (37333548).

Almost surely, 2^2155666512 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 2155666512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2986683840).

2155666512 is an abundant number, since it is smaller than the sum of its proper divisors (3817701168).

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

2155666512 is a wasteful number, since it uses less digits than its factorization.

2155666512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 535 counting only the distinct ones).

The product of its digits is 108000, while the sum is 39.

The square root of 2155666512 is about 46429.1558398384. The cubic root of 2155666512 is about 1291.7957707393.

The spelling of 2155666512 in words is "two billion, one hundred fifty-five million, six hundred sixty-six thousand, five hundred twelve".