1645571361587 has 2 divisors, whose sum is σ = 1645571361588. Its totient is φ = 1645571361586.

The previous prime is 1645571361559. The next prime is 1645571361611. The reversal of 1645571361587 is 7851631755461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1645571361587 - 2⁶ = 1645571361523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645571361487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822785680793 + 822785680794.

It is an arithmetic number, because the mean of its divisors is an integer number (822785680794).

Almost surely, 2^{1645571361587} is an apocalyptic number.

1645571361587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645571361587 is an equidigital number, since it uses as much as digits as its factorization.

1645571361587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168000, while the sum is 59.

The spelling of 1645571361587 in words is "one trillion, six hundred forty-five billion, five hundred seventy-one million, three hundred sixty-one thousand, five hundred eighty-seven".