427312081561 has 2 divisors, whose sum is σ = 427312081562. Its totient is φ = 427312081560.

The previous prime is 427312081499. The next prime is 427312081571. The reversal of 427312081561 is 165180213724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236517841561 + 190794240000 = 486331^2 + 436800^2 .

It is a cyclic number.

It is not a de Polignac number, because 427312081561 - 2⁷ = 427312081433 is a prime.

It is not a weakly prime, because it can be changed into another prime (427312081571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213656040780 + 213656040781.

It is an arithmetic number, because the mean of its divisors is an integer number (213656040781).

Almost surely, 2^427312081561 is an apocalyptic number.

It is an amenable number.

427312081561 is a deficient number, since it is larger than the sum of its proper divisors (1).

427312081561 is an equidigital number, since it uses as much as digits as its factorization.

427312081561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 427312081561 in words is "four hundred twenty-seven billion, three hundred twelve million, eighty-one thousand, five hundred sixty-one".