248256524561 has 4 divisors (see below), whose sum is σ = 248258068800. Its totient is φ = 248254980324.

The previous prime is 248256524543. The next prime is 248256524591. The reversal of 248256524561 is 165425652842.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248256524561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (248256524531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498701 + ... + 863258.

It is an arithmetic number, because the mean of its divisors is an integer number (62064517200).

Almost surely, 2^248256524561 is an apocalyptic number.

It is an amenable number.

248256524561 is a deficient number, since it is larger than the sum of its proper divisors (1544239).

248256524561 is a wasteful number, since it uses less digits than its factorization.

248256524561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544238.

The product of its digits is 4608000, while the sum is 50.

The spelling of 248256524561 in words is "two hundred forty-eight billion, two hundred fifty-six million, five hundred twenty-four thousand, five hundred sixty-one".