256612163674641 has 4 divisors (see below), whose sum is σ = 342149551566192. Its totient is φ = 171074775783092.

The previous prime is 256612163674523. The next prime is 256612163674649. The reversal of 256612163674641 is 146476361216652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256612163674641 - 2²¹ = 256612161577489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256612163674649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42768693945771 + ... + 42768693945776.

It is an arithmetic number, because the mean of its divisors is an integer number (85537387891548).

Almost surely, 2^{256612163674641} is an apocalyptic number.

It is an amenable number.

256612163674641 is a deficient number, since it is larger than the sum of its proper divisors (85537387891551).

256612163674641 is an equidigital number, since it uses as much as digits as its factorization.

256612163674641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85537387891550.

The product of its digits is 52254720, while the sum is 60.

The spelling of 256612163674641 in words is "two hundred fifty-six trillion, six hundred twelve billion, one hundred sixty-three million, six hundred seventy-four thousand, six hundred forty-one".