127581608290649 has 2 divisors, whose sum is σ = 127581608290650. Its totient is φ = 127581608290648.

The previous prime is 127581608290603. The next prime is 127581608290727. The reversal of 127581608290649 is 946092806185721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127324932307225 + 256675983424 = 11283835^2 + 506632^2 .

It is a cyclic number.

It is not a de Polignac number, because 127581608290649 - 2⁴⁴ = 109989422246233 is a prime.

It is not a weakly prime, because it can be changed into another prime (127581608298649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63790804145324 + 63790804145325.

It is an arithmetic number, because the mean of its divisors is an integer number (63790804145325).

Almost surely, 2^{127581608290649} is an apocalyptic number.

It is an amenable number.

127581608290649 is a deficient number, since it is larger than the sum of its proper divisors (1).

127581608290649 is an equidigital number, since it uses as much as digits as its factorization.

127581608290649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104509440, while the sum is 68.

The spelling of 127581608290649 in words is "one hundred twenty-seven trillion, five hundred eighty-one billion, six hundred eight million, two hundred ninety thousand, six hundred forty-nine".