256743500662221 has 8 divisors (see below), whose sum is σ = 343340467751424. Its totient is φ = 170654433673920.

The previous prime is 256743500662217. The next prime is 256743500662237. The reversal of 256743500662221 is 122266005347652.

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

It is not a de Polignac number, because 256743500662221 - 2² = 256743500662217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256743500662921) by changing a digit.

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, 126975024045 + ... + 126975026066.

It is an arithmetic number, because the mean of its divisors is an integer number (42917558468928).

Almost surely, 2^{256743500662221} is an apocalyptic number.

It is an amenable number.

256743500662221 is a deficient number, since it is larger than the sum of its proper divisors (86596967089203).

256743500662221 is a wasteful number, since it uses less digits than its factorization.

256743500662221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253950050451.

The product of its (nonzero) digits is 7257600, while the sum is 51.

The spelling of 256743500662221 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred million, six hundred sixty-two thousand, two hundred twenty-one".