256747376447 has 16 divisors (see below), whose sum is σ = 272402929920. Its totient is φ = 241307164800.

The previous prime is 256747376429. The next prime is 256747376449. The reversal of 256747376447 is 744673747652.

It is a cyclic number.

It is not a de Polignac number, because 256747376447 - 2⁶ = 256747376383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256747376447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256747376449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9801047 + ... + 9827207.

It is an arithmetic number, because the mean of its divisors is an integer number (17025183120).

Almost surely, 2^256747376447 is an apocalyptic number.

256747376447 is a deficient number, since it is larger than the sum of its proper divisors (15655553473).

256747376447 is a wasteful number, since it uses less digits than its factorization.

256747376447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30254.

The product of its digits is 165957120, while the sum is 62.

The spelling of 256747376447 in words is "two hundred fifty-six billion, seven hundred forty-seven million, three hundred seventy-six thousand, four hundred forty-seven".