1814788403521 has 2 divisors, whose sum is σ = 1814788403522. Its totient is φ = 1814788403520.

The previous prime is 1814788403429. The next prime is 1814788403531. The reversal of 1814788403521 is 1253048874181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1527599593521 + 287188810000 = 1235961^2 + 535900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1814788403521 - 2⁹ = 1814788403009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1814788403531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907394201760 + 907394201761.

It is an arithmetic number, because the mean of its divisors is an integer number (907394201761).

Almost surely, 2^{1814788403521} is an apocalyptic number.

It is an amenable number.

1814788403521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1814788403521 is an equidigital number, since it uses as much as digits as its factorization.

1814788403521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1720320, while the sum is 52.

The spelling of 1814788403521 in words is "one trillion, eight hundred fourteen billion, seven hundred eighty-eight million, four hundred three thousand, five hundred twenty-one".