1611643145 has 32 divisors (see below), whose sum is σ = 2236550400. Its totient is φ = 1092059136.

The previous prime is 1611643141. The next prime is 1611643157. The reversal of 1611643145 is 5413461161.

It is not a de Polignac number, because 1611643145 - 2² = 1611643141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1611643141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1249661 + ... + 1250949.

It is an arithmetic number, because the mean of its divisors is an integer number (69892200).

Almost surely, 2^1611643145 is an apocalyptic number.

It is an amenable number.

1611643145 is a deficient number, since it is larger than the sum of its proper divisors (624907255).

1611643145 is a wasteful number, since it uses less digits than its factorization.

1611643145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697.

The product of its digits is 8640, while the sum is 32.

The square root of 1611643145 is about 40145.2755003624. The cubic root of 1611643145 is about 1172.4373047765.

The spelling of 1611643145 in words is "one billion, six hundred eleven million, six hundred forty-three thousand, one hundred forty-five".