2155178080 has 48 divisors (see below), whose sum is σ = 5554486224. Its totient is φ = 783700480.

The previous prime is 2155178023. The next prime is 2155178101. The reversal of 2155178080 is 808715512.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 610507 + ... + 614026.

It is an arithmetic number, because the mean of its divisors is an integer number (115718463).

Almost surely, 2^2155178080 is an apocalyptic number.

2155178080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155178080 is an abundant number, since it is smaller than the sum of its proper divisors (3399308144).

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

2155178080 is a wasteful number, since it uses less digits than its factorization.

2155178080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224559 (or 1224551 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 37.

The square root of 2155178080 is about 46423.8955711388. The cubic root of 2155178080 is about 1291.6981981249.

The spelling of 2155178080 in words is "two billion, one hundred fifty-five million, one hundred seventy-eight thousand, eighty".