2145505555 has 16 divisors (see below), whose sum is σ = 2730816000. Its totient is φ = 1613645280.

The previous prime is 2145505547. The next prime is 2145505589. The reversal of 2145505555 is 5555055412.

It is not a de Polignac number, because 2145505555 - 2³ = 2145505547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73755 + ... + 98644.

It is an arithmetic number, because the mean of its divisors is an integer number (170676000).

Almost surely, 2^2145505555 is an apocalyptic number.

2145505555 is a deficient number, since it is larger than the sum of its proper divisors (585310445).

2145505555 is a wasteful number, since it uses less digits than its factorization.

2145505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172554.

The product of its (nonzero) digits is 125000, while the sum is 37.

The square root of 2145505555 is about 46319.6022759263. The cubic root of 2145505555 is about 1289.7629023617.

The spelling of 2145505555 in words is "two billion, one hundred forty-five million, five hundred five thousand, five hundred fifty-five".