256573405155770 has 32 divisors (see below), whose sum is σ = 464389134627600. Its totient is φ = 102061151953920.

The previous prime is 256573405155647. The next prime is 256573405155779. The reversal of 256573405155770 is 77551504375652.

It is a happy number.

256573405155770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 31186629081001 + 225386776074769 = 5584499^2 + 15012887^2 .

It is not an unprimeable number, because it can be changed into a prime (256573405155779) 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, 162383474 + ... + 163955906.

Almost surely, 2^{256573405155770} is an apocalyptic number.

256573405155770 is a deficient number, since it is larger than the sum of its proper divisors (207815729471830).

256573405155770 is a wasteful number, since it uses less digits than its factorization.

256573405155770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662770.

The product of its (nonzero) digits is 154350000, while the sum is 62.

The spelling of 256573405155770 in words is "two hundred fifty-six trillion, five hundred seventy-three billion, four hundred five million, one hundred fifty-five thousand, seven hundred seventy".