249521260642 has 16 divisors (see below), whose sum is σ = 381385360440. Its totient is φ = 122393320192.

The previous prime is 249521260601. The next prime is 249521260661. The reversal of 249521260642 is 246062125942.

It can be written as a sum of positive squares in 4 ways, for example, as 189171933721 + 60349326921 = 434939^2 + 245661^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887034 + ... + 1133962.

Almost surely, 2^249521260642 is an apocalyptic number.

249521260642 is a deficient number, since it is larger than the sum of its proper divisors (131864099798).

249521260642 is a wasteful number, since it uses less digits than its factorization.

249521260642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256517.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 249521260642 in words is "two hundred forty-nine billion, five hundred twenty-one million, two hundred sixty thousand, six hundred forty-two".