1255501555447 has 2 divisors, whose sum is σ = 1255501555448. Its totient is φ = 1255501555446.

The previous prime is 1255501555439. The next prime is 1255501555463. The reversal of 1255501555447 is 7445551055521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1255501555447 - 2³ = 1255501555439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1255501555447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255501553447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627750777723 + 627750777724.

It is an arithmetic number, because the mean of its divisors is an integer number (627750777724).

Almost surely, 2^{1255501555447} is an apocalyptic number.

1255501555447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255501555447 is an equidigital number, since it uses as much as digits as its factorization.

1255501555447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3500000, while the sum is 49.

The spelling of 1255501555447 in words is "one trillion, two hundred fifty-five billion, five hundred one million, five hundred fifty-five thousand, four hundred forty-seven".