256121606262 has 8 divisors (see below), whose sum is σ = 512243212536. Its totient is φ = 85373868752.

The previous prime is 256121606249. The next prime is 256121606281. The reversal of 256121606262 is 262606121652.

It is a sphenic number, since it is the product of 3 distinct primes.

256121606262 is an admirable number.

It is a super-2 number, since 2×256121606262² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256121606262.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21343467183 + ... + 21343467194.

It is an arithmetic number, because the mean of its divisors is an integer number (64030401567).

Almost surely, 2^256121606262 is an apocalyptic number.

256121606262 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256121606262 is a wasteful number, since it uses less digits than its factorization.

256121606262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42686934382.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 256121606262 in words is "two hundred fifty-six billion, one hundred twenty-one million, six hundred six thousand, two hundred sixty-two".