190497080805781 has 2 divisors, whose sum is σ = 190497080805782. Its totient is φ = 190497080805780.

The previous prime is 190497080805677. The next prime is 190497080805799. The reversal of 190497080805781 is 187508080794091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176533473828100 + 13963606977681 = 13286590^2 + 3736791^2 .

It is a cyclic number.

It is not a de Polignac number, because 190497080805781 - 2¹⁹ = 190497080281493 is a prime.

It is a super-2 number, since 2×190497080805781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190497080805481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95248540402890 + 95248540402891.

It is an arithmetic number, because the mean of its divisors is an integer number (95248540402891).

Almost surely, 2^{190497080805781} is an apocalyptic number.

It is an amenable number.

190497080805781 is a deficient number, since it is larger than the sum of its proper divisors (1).

190497080805781 is an equidigital number, since it uses as much as digits as its factorization.

190497080805781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40642560, while the sum is 67.

The spelling of 190497080805781 in words is "one hundred ninety trillion, four hundred ninety-seven billion, eighty million, eight hundred five thousand, seven hundred eighty-one".