1645432262281 has 2 divisors, whose sum is σ = 1645432262282. Its totient is φ = 1645432262280.

The previous prime is 1645432262261. The next prime is 1645432262311. The reversal of 1645432262281 is 1822622345461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140324979600 + 505107282681 = 1067860^2 + 710709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645432262281 - 2²¹ = 1645430165129 is a prime.

It is a super-2 number, since 2×1645432262281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1645432262231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822716131140 + 822716131141.

It is an arithmetic number, because the mean of its divisors is an integer number (822716131141).

Almost surely, 2^{1645432262281} is an apocalyptic number.

It is an amenable number.

1645432262281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645432262281 is an equidigital number, since it uses as much as digits as its factorization.

1645432262281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1105920, while the sum is 46.

The spelling of 1645432262281 in words is "one trillion, six hundred forty-five billion, four hundred thirty-two million, two hundred sixty-two thousand, two hundred eighty-one".