256506400165064 has 32 divisors (see below), whose sum is σ = 549661317329280. Its totient is φ = 109930365247104.

The previous prime is 256506400165051. The next prime is 256506400165109. The reversal of 256506400165064 is 460561004605652.

It is a super-2 number, since 2×256506400165064² (a number of 30 digits) contains 22 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 13209677 + ... + 26220380.

It is an arithmetic number, because the mean of its divisors is an integer number (17176916166540).

Almost surely, 2^{256506400165064} is an apocalyptic number.

It is an amenable number.

256506400165064 is an abundant number, since it is smaller than the sum of its proper divisors (293154917164216).

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

256506400165064 is a wasteful number, since it uses less digits than its factorization.

256506400165064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39546237 (or 39546233 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 256506400165064 in words is "two hundred fifty-six trillion, five hundred six billion, four hundred million, one hundred sixty-five thousand, sixty-four".