256517303612547 has 16 divisors (see below), whose sum is σ = 357022995978240. Its totient is φ = 163635539812800.

The previous prime is 256517303612497. The next prime is 256517303612567. The reversal of 256517303612547 is 745216303715652.

It is not a de Polignac number, because 256517303612547 - 2⁸ = 256517303612291 is a prime.

It is a super-2 number, since 2×256517303612547² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256517303612567) 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, 15495781479 + ... + 15495798032.

It is an arithmetic number, because the mean of its divisors is an integer number (22313937248640).

Almost surely, 2^{256517303612547} is an apocalyptic number.

256517303612547 is a deficient number, since it is larger than the sum of its proper divisors (100505692365693).

256517303612547 is a wasteful number, since it uses less digits than its factorization.

256517303612547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30991579634.

The product of its (nonzero) digits is 31752000, while the sum is 57.

The spelling of 256517303612547 in words is "two hundred fifty-six trillion, five hundred seventeen billion, three hundred three million, six hundred twelve thousand, five hundred forty-seven".