256507767641055 has 32 divisors (see below), whose sum is σ = 479950746637824. Its totient is φ = 114533700898176.

The previous prime is 256507767641029. The next prime is 256507767641089. The reversal of 256507767641055 is 550146767705652.

It is a happy number.

It is not a de Polignac number, because 256507767641055 - 2⁶ = 256507767640991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28406171304 + ... + 28406180333.

It is an arithmetic number, because the mean of its divisors is an integer number (14998460832432).

Almost surely, 2^{256507767641055} is an apocalyptic number.

256507767641055 is a deficient number, since it is larger than the sum of its proper divisors (223442978996769).

256507767641055 is a wasteful number, since it uses less digits than its factorization.

256507767641055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56812351695.

The product of its (nonzero) digits is 370440000, while the sum is 66.

The spelling of 256507767641055 in words is "two hundred fifty-six trillion, five hundred seven billion, seven hundred sixty-seven million, six hundred forty-one thousand, fifty-five".