256511236722 has 16 divisors (see below), whose sum is σ = 552485740800. Its totient is φ = 78926534352.

The previous prime is 256511236721. The next prime is 256511236763. The reversal of 256511236722 is 227632115652.

It is not an unprimeable number, because it can be changed into a prime (256511236721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1644302722 + ... + 1644302877.

It is an arithmetic number, because the mean of its divisors is an integer number (34530358800).

Almost surely, 2^256511236722 is an apocalyptic number.

256511236722 is an abundant number, since it is smaller than the sum of its proper divisors (295974504078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256511236722 is a wasteful number, since it uses less digits than its factorization.

256511236722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288605617.

The product of its digits is 302400, while the sum is 42.

The spelling of 256511236722 in words is "two hundred fifty-six billion, five hundred eleven million, two hundred thirty-six thousand, seven hundred twenty-two".