2145204555 has 16 divisors (see below), whose sum is σ = 3696352800. Its totient is φ = 1056100608.

The previous prime is 2145204553. The next prime is 2145204577. The reversal of 2145204555 is 5554025412.

It is not a de Polignac number, because 2145204555 - 2¹ = 2145204553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145204553) 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, 5500330 + ... + 5500719.

It is an arithmetic number, because the mean of its divisors is an integer number (231022050).

Almost surely, 2^2145204555 is an apocalyptic number.

2145204555 is a deficient number, since it is larger than the sum of its proper divisors (1551148245).

2145204555 is a wasteful number, since it uses less digits than its factorization.

2145204555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11001070.

The product of its (nonzero) digits is 40000, while the sum is 33.

The square root of 2145204555 is about 46316.3529976185. The cubic root of 2145204555 is about 1289.7025845205.

Adding to 2145204555 its reverse (5554025412), we get a palindrome (7699229967).

The spelling of 2145204555 in words is "two billion, one hundred forty-five million, two hundred four thousand, five hundred fifty-five".