243933257639 has 8 divisors (see below), whose sum is σ = 252063024240. Its totient is φ = 235884384576.

The previous prime is 243933257629. The next prime is 243933257663. The reversal of 243933257639 is 936752339342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243933257639 - 2²⁰ = 243932209063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243933257629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20217254 + ... + 20229315.

It is an arithmetic number, because the mean of its divisors is an integer number (31507878030).

Almost surely, 2^243933257639 is an apocalyptic number.

243933257639 is a deficient number, since it is larger than the sum of its proper divisors (8129766601).

243933257639 is a wasteful number, since it uses less digits than its factorization.

243933257639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40446769.

The product of its digits is 22044960, while the sum is 56.

The spelling of 243933257639 in words is "two hundred forty-three billion, nine hundred thirty-three million, two hundred fifty-seven thousand, six hundred thirty-nine".