144640577561 has 2 divisors, whose sum is σ = 144640577562. Its totient is φ = 144640577560.

The previous prime is 144640577537. The next prime is 144640577569. The reversal of 144640577561 is 165775046441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96534490000 + 48106087561 = 310700^2 + 219331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144640577561 is a prime.

It is not a weakly prime, because it can be changed into another prime (144640577569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72320288780 + 72320288781.

It is an arithmetic number, because the mean of its divisors is an integer number (72320288781).

Almost surely, 2^144640577561 is an apocalyptic number.

It is an amenable number.

144640577561 is a deficient number, since it is larger than the sum of its proper divisors (1).

144640577561 is an equidigital number, since it uses as much as digits as its factorization.

144640577561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 144640577561 in words is "one hundred forty-four billion, six hundred forty million, five hundred seventy-seven thousand, five hundred sixty-one".