1813490566541 has 2 divisors, whose sum is σ = 1813490566542. Its totient is φ = 1813490566540.

The previous prime is 1813490566513. The next prime is 1813490566567. The reversal of 1813490566541 is 1456650943181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191961732900 + 621528833641 = 1091770^2 + 788371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813490566541 - 2¹⁰ = 1813490565517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813490526541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906745283270 + 906745283271.

It is an arithmetic number, because the mean of its divisors is an integer number (906745283271).

Almost surely, 2^{1813490566541} is an apocalyptic number.

It is an amenable number.

1813490566541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813490566541 is an equidigital number, since it uses as much as digits as its factorization.

1813490566541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 1813490566541 in words is "one trillion, eight hundred thirteen billion, four hundred ninety million, five hundred sixty-six thousand, five hundred forty-one".