256735943898 has 32 divisors (see below), whose sum is σ = 586854738816. Its totient is φ = 73349411328.

The previous prime is 256735943887. The next prime is 256735943909. The reversal of 256735943898 is 898349537652.

It is an interprime number because it is at equal distance from previous prime (256735943887) and next prime (256735943909).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745890 + ... + 1034322.

It is an arithmetic number, because the mean of its divisors is an integer number (18339210588).

Almost surely, 2^256735943898 is an apocalyptic number.

256735943898 is an abundant number, since it is smaller than the sum of its proper divisors (330118794918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256735943898 is a wasteful number, since it uses less digits than its factorization.

256735943898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309638.

The product of its digits is 391910400, while the sum is 69.

The spelling of 256735943898 in words is "two hundred fifty-six billion, seven hundred thirty-five million, nine hundred forty-three thousand, eight hundred ninety-eight".