256402023473 has 8 divisors (see below), whose sum is σ = 271492526592. Its totient is φ = 241312412736.

The previous prime is 256402023469. The next prime is 256402023511. The reversal of 256402023473 is 374320204652.

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

It is not a de Polignac number, because 256402023473 - 2² = 256402023469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256402023443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 421736 + ... + 831062.

It is an arithmetic number, because the mean of its divisors is an integer number (33936565824).

Almost surely, 2^256402023473 is an apocalyptic number.

It is an amenable number.

256402023473 is a deficient number, since it is larger than the sum of its proper divisors (15090503119).

256402023473 is a wasteful number, since it uses less digits than its factorization.

256402023473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446191.

The product of its (nonzero) digits is 241920, while the sum is 38.

The spelling of 256402023473 in words is "two hundred fifty-six billion, four hundred two million, twenty-three thousand, four hundred seventy-three".