256506420452 has 6 divisors (see below), whose sum is σ = 448886235798. Its totient is φ = 128253210224.

The previous prime is 256506420433. The next prime is 256506420463. The reversal of 256506420452 is 254024605652.

It can be written as a sum of positive squares in only one way, i.e., 228585347236 + 27921073216 = 478106^2 + 167096^2 .

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 as a sum of consecutive naturals, namely, 32063302553 + ... + 32063302560.

It is an arithmetic number, because the mean of its divisors is an integer number (74814372633).

Almost surely, 2^256506420452 is an apocalyptic number.

It is an amenable number.

256506420452 is a deficient number, since it is larger than the sum of its proper divisors (192379815346).

256506420452 is a wasteful number, since it uses less digits than its factorization.

256506420452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64126605117 (or 64126605115 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 256506420452 in words is "two hundred fifty-six billion, five hundred six million, four hundred twenty thousand, four hundred fifty-two".