2543948217899 has 4 divisors (see below), whose sum is σ = 2775216237720. Its totient is φ = 2312680198080.

The previous prime is 2543948217883. The next prime is 2543948217931. The reversal of 2543948217899 is 9987128493452.

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 2543948217899 - 2⁴ = 2543948217883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543948217829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115634009894 + ... + 115634009915.

It is an arithmetic number, because the mean of its divisors is an integer number (693804059430).

Almost surely, 2^{2543948217899} is an apocalyptic number.

2543948217899 is a deficient number, since it is larger than the sum of its proper divisors (231268019821).

2543948217899 is a wasteful number, since it uses less digits than its factorization.

2543948217899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231268019820.

The product of its digits is 313528320, while the sum is 71.

The spelling of 2543948217899 in words is "two trillion, five hundred forty-three billion, nine hundred forty-eight million, two hundred seventeen thousand, eight hundred ninety-nine".