1603781897461 has 2 divisors, whose sum is σ = 1603781897462. Its totient is φ = 1603781897460.

The previous prime is 1603781897441. The next prime is 1603781897477. The reversal of 1603781897461 is 1647981873061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 946699810225 + 657082087236 = 972985^2 + 810606^2 .

It is an emirp because it is prime and its reverse (1647981873061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1603781897461 - 2⁹ = 1603781896949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1603781897461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1603781897441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801890948730 + 801890948731.

It is an arithmetic number, because the mean of its divisors is an integer number (801890948731).

Almost surely, 2^{1603781897461} is an apocalyptic number.

It is an amenable number.

1603781897461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1603781897461 is an equidigital number, since it uses as much as digits as its factorization.

1603781897461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 61.

The spelling of 1603781897461 in words is "one trillion, six hundred three billion, seven hundred eighty-one million, eight hundred ninety-seven thousand, four hundred sixty-one".