256823127553654 has 4 divisors (see below), whose sum is σ = 385234691330484. Its totient is φ = 128411563776826.

The previous prime is 256823127553651. The next prime is 256823127553693. The reversal of 256823127553654 is 456355721328652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256823127553651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64205781888412 + ... + 64205781888415.

It is an arithmetic number, because the mean of its divisors is an integer number (96308672832621).

Almost surely, 2^{256823127553654} is an apocalyptic number.

256823127553654 is a deficient number, since it is larger than the sum of its proper divisors (128411563776830).

256823127553654 is a wasteful number, since it uses less digits than its factorization.

256823127553654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128411563776829.

The product of its digits is 362880000, while the sum is 64.

The spelling of 256823127553654 in words is "two hundred fifty-six trillion, eight hundred twenty-three billion, one hundred twenty-seven million, five hundred fifty-three thousand, six hundred fifty-four".