256648818001 has 4 divisors (see below), whose sum is σ = 257671323504. Its totient is φ = 255626312500.

The previous prime is 256648817993. The next prime is 256648818059. The reversal of 256648818001 is 100818846652.

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 256648818001 - 2³ = 256648817993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256648818071) 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, 511252375 + ... + 511252876.

It is an arithmetic number, because the mean of its divisors is an integer number (64417830876).

Almost surely, 2^256648818001 is an apocalyptic number.

It is an amenable number.

256648818001 is a deficient number, since it is larger than the sum of its proper divisors (1022505503).

256648818001 is a wasteful number, since it uses less digits than its factorization.

256648818001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022505502.

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 256648818001 in words is "two hundred fifty-six billion, six hundred forty-eight million, eight hundred eighteen thousand, one".