256603217527 has 2 divisors, whose sum is σ = 256603217528. Its totient is φ = 256603217526.

The previous prime is 256603217483. The next prime is 256603217561. The reversal of 256603217527 is 725712306652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256603217527 - 2¹⁹ = 256602693239 is a prime.

It is a super-2 number, since 2×256603217527² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256603217567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128301608763 + 128301608764.

It is an arithmetic number, because the mean of its divisors is an integer number (128301608764).

Almost surely, 2^256603217527 is an apocalyptic number.

256603217527 is a deficient number, since it is larger than the sum of its proper divisors (1).

256603217527 is an equidigital number, since it uses as much as digits as its factorization.

256603217527 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 256603217527 in words is "two hundred fifty-six billion, six hundred three million, two hundred seventeen thousand, five hundred twenty-seven".