1645555171363 has 2 divisors, whose sum is σ = 1645555171364. Its totient is φ = 1645555171362.

The previous prime is 1645555171361. The next prime is 1645555171409. The reversal of 1645555171363 is 3631715555461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645555171363 - 2¹ = 1645555171361 is a prime.

Together with 1645555171361, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1645555171363.

It is not a weakly prime, because it can be changed into another prime (1645555171361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822777585681 + 822777585682.

It is an arithmetic number, because the mean of its divisors is an integer number (822777585682).

Almost surely, 2^{1645555171363} is an apocalyptic number.

1645555171363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645555171363 is an equidigital number, since it uses as much as digits as its factorization.

1645555171363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670000, while the sum is 52.

The spelling of 1645555171363 in words is "one trillion, six hundred forty-five billion, five hundred fifty-five million, one hundred seventy-one thousand, three hundred sixty-three".