257523340042 has 8 divisors (see below), whose sum is σ = 386296294500. Its totient is φ = 128757908544.

The previous prime is 257523340037. The next prime is 257523340069. The reversal of 257523340042 is 240043325752.

It can be written as a sum of positive squares in 2 ways, for example, as 218061914841 + 39461425201 = 466971^2 + 198649^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 257523339983 and 257523340010.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794367 + ... + 1932562.

Almost surely, 2^257523340042 is an apocalyptic number.

257523340042 is a deficient number, since it is larger than the sum of its proper divisors (128772954458).

257523340042 is a wasteful number, since it uses less digits than its factorization.

257523340042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3761480.

The product of its (nonzero) digits is 201600, while the sum is 37.

Adding to 257523340042 its reverse (240043325752), we get a palindrome (497566665794).

The spelling of 257523340042 in words is "two hundred fifty-seven billion, five hundred twenty-three million, three hundred forty thousand, forty-two".