2005243155 has 64 divisors (see below), whose sum is σ = 3731328000. Its totient is φ = 1019817216.

The previous prime is 2005243133. The next prime is 2005243171. The reversal of 2005243155 is 5513425002.

It is a happy number.

It is not a de Polignac number, because 2005243155 - 2¹² = 2005239059 is a prime.

It is a super-2 number, since 2×2005243155² = 8042000221348708050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1269156 + ... + 1270734.

It is an arithmetic number, because the mean of its divisors is an integer number (58302000).

Almost surely, 2^2005243155 is an apocalyptic number.

2005243155 is a deficient number, since it is larger than the sum of its proper divisors (1726084845).

2005243155 is a wasteful number, since it uses less digits than its factorization.

2005243155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025 (or 2019 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 2005243155 is about 44779.9414358706. The cubic root of 2005243155 is about 1261.0210827391.

Adding to 2005243155 its reverse (5513425002), we get a palindrome (7518668157).

The spelling of 2005243155 in words is "two billion, five million, two hundred forty-three thousand, one hundred fifty-five".