256648818002 has 4 divisors (see below), whose sum is σ = 384973227006. Its totient is φ = 128324409000.

The previous prime is 256648817993. The next prime is 256648818059. The reversal of 256648818002 is 200818846652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 141435414241 + 115213403761 = 376079^2 + 339431^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64162204499 + ... + 64162204502.

Almost surely, 2^256648818002 is an apocalyptic number.

256648818002 is a deficient number, since it is larger than the sum of its proper divisors (128324409004).

256648818002 is a wasteful number, since it uses less digits than its factorization.

256648818002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128324409003.

The product of its (nonzero) digits is 1474560, while the sum is 50.

The spelling of 256648818002 in words is "two hundred fifty-six billion, six hundred forty-eight million, eight hundred eighteen thousand, two".