256573324777 has 16 divisors (see below), whose sum is σ = 320103014400. Its totient is φ = 199790148240.

The previous prime is 256573324757. The next prime is 256573324807. The reversal of 256573324777 is 777423375652.

It is a cyclic number.

It is not a de Polignac number, because 256573324777 - 2¹⁵ = 256573292009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256573324757) 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, 1029577 + ... + 1254262.

It is an arithmetic number, because the mean of its divisors is an integer number (20006438400).

Almost surely, 2^256573324777 is an apocalyptic number.

It is an amenable number.

256573324777 is a deficient number, since it is larger than the sum of its proper divisors (63529689623).

256573324777 is a wasteful number, since it uses less digits than its factorization.

256573324777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285316.

The product of its digits is 51861600, while the sum is 58.

The spelling of 256573324777 in words is "two hundred fifty-six billion, five hundred seventy-three million, three hundred twenty-four thousand, seven hundred seventy-seven".