2155631366 has 32 divisors (see below), whose sum is σ = 3795061248. Its totient is φ = 899075520.

The previous prime is 2155631363. The next prime is 2155631389. The reversal of 2155631366 is 6631365512.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155631363) 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, 162791 + ... + 175533.

It is an arithmetic number, because the mean of its divisors is an integer number (118595664).

Almost surely, 2^2155631366 is an apocalyptic number.

2155631366 is a deficient number, since it is larger than the sum of its proper divisors (1639429882).

2155631366 is a wasteful number, since it uses less digits than its factorization.

2155631366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13076.

The product of its digits is 97200, while the sum is 38.

The square root of 2155631366 is about 46428.7773476752. Note that the first 3 decimals coincide. The cubic root of 2155631366 is about 1291.7887502191.

Adding to 2155631366 its reverse (6631365512), we get a palindrome (8786996878).

The spelling of 2155631366 in words is "two billion, one hundred fifty-five million, six hundred thirty-one thousand, three hundred sixty-six".