243454737257 has 4 divisors (see below), whose sum is σ = 244799791236. Its totient is φ = 242109683280.

The previous prime is 243454737241. The next prime is 243454737259. The reversal of 243454737257 is 752737454342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28667907856 + 214786829401 = 169316^2 + 463451^2 .

It is a cyclic number.

It is not a de Polignac number, because 243454737257 - 2⁴ = 243454737241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243454737199 and 243454737208.

It is not an unprimeable number, because it can be changed into a prime (243454737259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672526718 + ... + 672527079.

It is an arithmetic number, because the mean of its divisors is an integer number (61199947809).

Almost surely, 2^243454737257 is an apocalyptic number.

It is an amenable number.

243454737257 is a deficient number, since it is larger than the sum of its proper divisors (1345053979).

243454737257 is a wasteful number, since it uses less digits than its factorization.

243454737257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345053978.

The product of its digits is 19756800, while the sum is 53.

The spelling of 243454737257 in words is "two hundred forty-three billion, four hundred fifty-four million, seven hundred thirty-seven thousand, two hundred fifty-seven".