256531342047 has 8 divisors (see below), whose sum is σ = 342044128944. Its totient is φ = 171019724928.

The previous prime is 256531342033. The next prime is 256531342051. The reversal of 256531342047 is 740243135652.

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

It is not a de Polignac number, because 256531342047 - 2¹⁶ = 256531276511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256531342087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718753 + ... + 1014725.

It is an arithmetic number, because the mean of its divisors is an integer number (42755516118).

Almost surely, 2^256531342047 is an apocalyptic number.

256531342047 is a deficient number, since it is larger than the sum of its proper divisors (85512786897).

256531342047 is a wasteful number, since it uses less digits than its factorization.

256531342047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584889.

The product of its (nonzero) digits is 604800, while the sum is 42.

Adding to 256531342047 its reverse (740243135652), we get a palindrome (996774477699).

The spelling of 256531342047 in words is "two hundred fifty-six billion, five hundred thirty-one million, three hundred forty-two thousand, forty-seven".