1543995804497 has 2 divisors, whose sum is σ = 1543995804498. Its totient is φ = 1543995804496.

The previous prime is 1543995804493. The next prime is 1543995804509. The reversal of 1543995804497 is 7944085993451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1033687023616 + 510308780881 = 1016704^2 + 714359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1543995804497 - 2² = 1543995804493 is a prime.

It is not a weakly prime, because it can be changed into another prime (1543995804493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771997902248 + 771997902249.

It is an arithmetic number, because the mean of its divisors is an integer number (771997902249).

Almost surely, 2^{1543995804497} is an apocalyptic number.

It is an amenable number.

1543995804497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543995804497 is an equidigital number, since it uses as much as digits as its factorization.

1543995804497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 195955200, while the sum is 68.

The spelling of 1543995804497 in words is "one trillion, five hundred forty-three billion, nine hundred ninety-five million, eight hundred four thousand, four hundred ninety-seven".