2155476660 has 48 divisors (see below), whose sum is σ = 6352987200. Its totient is φ = 544541184.

The previous prime is 2155476643. The next prime is 2155476667. The reversal of 2155476660 is 666745512.

2155476660 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155476667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944245 + ... + 946524.

It is an arithmetic number, because the mean of its divisors is an integer number (132353900).

Almost surely, 2^2155476660 is an apocalyptic number.

2155476660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155476660 is an abundant number, since it is smaller than the sum of its proper divisors (4197510540).

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

2155476660 is a wasteful number, since it uses less digits than its factorization.

2155476660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890800 (or 1890798 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 2155476660 is about 46427.1112605555. Note that the first 3 decimals coincide. The cubic root of 2155476660 is about 1291.7578463186.

The spelling of 2155476660 in words is "two billion, one hundred fifty-five million, four hundred seventy-six thousand, six hundred sixty".