257246440242 has 32 divisors (see below), whose sum is σ = 562604555520. Its totient is φ = 77767411920.

The previous prime is 257246440237. The next prime is 257246440271. The reversal of 257246440242 is 242044642752.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 257246440194 and 257246440203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4623508 + ... + 4678815.

It is an arithmetic number, because the mean of its divisors is an integer number (17581392360).

Almost surely, 2^257246440242 is an apocalyptic number.

257246440242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

257246440242 is an abundant number, since it is smaller than the sum of its proper divisors (305358115278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257246440242 is a wasteful number, since it uses less digits than its factorization.

257246440242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9302758.

The product of its (nonzero) digits is 860160, while the sum is 42.

The spelling of 257246440242 in words is "two hundred fifty-seven billion, two hundred forty-six million, four hundred forty thousand, two hundred forty-two".