2645144899 has 4 divisors (see below), whose sum is σ = 2664452664. Its totient is φ = 2625837136.

The previous prime is 2645144867. The next prime is 2645144921. The reversal of 2645144899 is 9984415462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2645144899 - 2⁵ = 2645144867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645144809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9653677 + ... + 9653950.

It is an arithmetic number, because the mean of its divisors is an integer number (666113166).

Almost surely, 2^2645144899 is an apocalyptic number.

2645144899 is a deficient number, since it is larger than the sum of its proper divisors (19307765).

2645144899 is a wasteful number, since it uses less digits than its factorization.

2645144899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19307764.

The product of its digits is 2488320, while the sum is 52.

The square root of 2645144899 is about 51430.9721763064. The cubic root of 2645144899 is about 1382.9818772833.

The spelling of 2645144899 in words is "two billion, six hundred forty-five million, one hundred forty-four thousand, eight hundred ninety-nine".