256409340188 has 12 divisors (see below), whose sum is σ = 475111424592. Its totient is φ = 120663218880.

The previous prime is 256409340169. The next prime is 256409340203. The reversal of 256409340188 is 881043904652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885362728 + ... + 1885362863.

It is an arithmetic number, because the mean of its divisors is an integer number (39592618716).

Almost surely, 2^256409340188 is an apocalyptic number.

It is an amenable number.

256409340188 is a deficient number, since it is larger than the sum of its proper divisors (218702084404).

256409340188 is a wasteful number, since it uses less digits than its factorization.

256409340188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770725612 (or 3770725610 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 256409340188 in words is "two hundred fifty-six billion, four hundred nine million, three hundred forty thousand, one hundred eighty-eight".