256350421023 has 16 divisors (see below), whose sum is σ = 344045184000. Its totient is φ = 169781585760.

The previous prime is 256350421021. The next prime is 256350421049. The reversal of 256350421023 is 320124053652.

It is a happy number.

It is not a de Polignac number, because 256350421023 - 2¹ = 256350421021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256350421021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168003 + ... + 735476.

It is an arithmetic number, because the mean of its divisors is an integer number (21502824000).

Almost surely, 2^256350421023 is an apocalyptic number.

256350421023 is a deficient number, since it is larger than the sum of its proper divisors (87694762977).

256350421023 is a wasteful number, since it uses less digits than its factorization.

256350421023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904102.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 256350421023 its reverse (320124053652), we get a palindrome (576474474675).

The spelling of 256350421023 in words is "two hundred fifty-six billion, three hundred fifty million, four hundred twenty-one thousand, twenty-three".