249865520242 has 16 divisors (see below), whose sum is σ = 407625247512. Its totient is φ = 114180739200.

The previous prime is 249865520239. The next prime is 249865520251. The reversal of 249865520242 is 242025568942.

It can be written as a sum of positive squares in 4 ways, for example, as 249779048841 + 86471401 = 499779^2 + 9299^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47572683 + ... + 47577934.

Almost surely, 2^249865520242 is an apocalyptic number.

249865520242 is a deficient number, since it is larger than the sum of its proper divisors (157759727270).

249865520242 is a wasteful number, since it uses less digits than its factorization.

249865520242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95150733.

The product of its (nonzero) digits is 2764800, while the sum is 49.

The spelling of 249865520242 in words is "two hundred forty-nine billion, eight hundred sixty-five million, five hundred twenty thousand, two hundred forty-two".