240206254257 has 16 divisors (see below), whose sum is σ = 331835512320. Its totient is φ = 154395657600.

The previous prime is 240206254243. The next prime is 240206254273. The reversal of 240206254257 is 752452602042.

It is not a de Polignac number, because 240206254257 - 2⁶ = 240206254193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (240206254957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4775844 + ... + 4825877.

It is an arithmetic number, because the mean of its divisors is an integer number (20739719520).

Almost surely, 2^240206254257 is an apocalyptic number.

It is an amenable number.

240206254257 is a deficient number, since it is larger than the sum of its proper divisors (91629258063).

240206254257 is a wasteful number, since it uses less digits than its factorization.

240206254257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9602024.

The product of its (nonzero) digits is 268800, while the sum is 39.

Adding to 240206254257 its reverse (752452602042), we get a palindrome (992658856299).

The spelling of 240206254257 in words is "two hundred forty billion, two hundred six million, two hundred fifty-four thousand, two hundred fifty-seven".