1780791144497 has 2 divisors, whose sum is σ = 1780791144498. Its totient is φ = 1780791144496.

The previous prime is 1780791144487. The next prime is 1780791144553. The reversal of 1780791144497 is 7944411970871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1506844631296 + 273946513201 = 1227536^2 + 523399^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780791144497 - 2³⁸ = 1505913237553 is a prime.

It is not a weakly prime, because it can be changed into another prime (1780791144487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890395572248 + 890395572249.

It is an arithmetic number, because the mean of its divisors is an integer number (890395572249).

Almost surely, 2^{1780791144497} is an apocalyptic number.

It is an amenable number.

1780791144497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780791144497 is an equidigital number, since it uses as much as digits as its factorization.

1780791144497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 1780791144497 in words is "one trillion, seven hundred eighty billion, seven hundred ninety-one million, one hundred forty-four thousand, four hundred ninety-seven".