145565320081 has 2 divisors, whose sum is σ = 145565320082. Its totient is φ = 145565320080.

The previous prime is 145565320067. The next prime is 145565320099. The reversal of 145565320081 is 180023565541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73839910225 + 71725409856 = 271735^2 + 267816^2 .

It is a cyclic number.

It is not a de Polignac number, because 145565320081 - 2⁷ = 145565319953 is a prime.

It is a super-2 number, since 2×145565320081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145565320781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72782660040 + 72782660041.

It is an arithmetic number, because the mean of its divisors is an integer number (72782660041).

Almost surely, 2^145565320081 is an apocalyptic number.

It is an amenable number.

145565320081 is a deficient number, since it is larger than the sum of its proper divisors (1).

145565320081 is an equidigital number, since it uses as much as digits as its factorization.

145565320081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 145565320081 in words is "one hundred forty-five billion, five hundred sixty-five million, three hundred twenty thousand, eighty-one".