1256646204487 has 2 divisors, whose sum is σ = 1256646204488. Its totient is φ = 1256646204486.

The previous prime is 1256646204481. The next prime is 1256646204551. The reversal of 1256646204487 is 7844026466521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256646204487 - 2³ = 1256646204479 is a prime.

It is a super-3 number, since 3×1256646204487³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256646204481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628323102243 + 628323102244.

It is an arithmetic number, because the mean of its divisors is an integer number (628323102244).

Almost surely, 2^{1256646204487} is an apocalyptic number.

1256646204487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256646204487 is an equidigital number, since it uses as much as digits as its factorization.

1256646204487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 1256646204487 in words is "one trillion, two hundred fifty-six billion, six hundred forty-six million, two hundred four thousand, four hundred eighty-seven".