1603540455821 has 2 divisors, whose sum is σ = 1603540455822. Its totient is φ = 1603540455820.

The previous prime is 1603540455817. The next prime is 1603540455827. The reversal of 1603540455821 is 1285540453061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1130842954921 + 472697500900 = 1063411^2 + 687530^2 .

It is a cyclic number.

It is not a de Polignac number, because 1603540455821 - 2² = 1603540455817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1603540455827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801770227910 + 801770227911.

It is an arithmetic number, because the mean of its divisors is an integer number (801770227911).

Almost surely, 2^{1603540455821} is an apocalyptic number.

It is an amenable number.

1603540455821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603540455821 is an equidigital number, since it uses as much as digits as its factorization.

1603540455821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 1603540455821 in words is "one trillion, six hundred three billion, five hundred forty million, four hundred fifty-five thousand, eight hundred twenty-one".