1645736621147 has 2 divisors, whose sum is σ = 1645736621148. Its totient is φ = 1645736621146.

The previous prime is 1645736621141. The next prime is 1645736621153. The reversal of 1645736621147 is 7411266375461.

It is a balanced prime because it is at equal distance from previous prime (1645736621141) and next prime (1645736621153).

It is a cyclic number.

It is not a de Polignac number, because 1645736621147 - 2¹⁰ = 1645736620123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645736621141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822868310573 + 822868310574.

It is an arithmetic number, because the mean of its divisors is an integer number (822868310574).

Almost surely, 2^{1645736621147} is an apocalyptic number.

1645736621147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645736621147 is an equidigital number, since it uses as much as digits as its factorization.

1645736621147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 53.

The spelling of 1645736621147 in words is "one trillion, six hundred forty-five billion, seven hundred thirty-six million, six hundred twenty-one thousand, one hundred forty-seven".