42544665601 has 2 divisors, whose sum is σ = 42544665602. Its totient is φ = 42544665600.

The previous prime is 42544665571. The next prime is 42544665607. The reversal of 42544665601 is 10656644524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27307232001 + 15237433600 = 165249^2 + 123440^2 .

It is a cyclic number.

It is not a de Polignac number, because 42544665601 - 2³¹ = 40397181953 is a prime.

It is a super-2 number, since 2×42544665601² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42544665607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272332800 + 21272332801.

It is an arithmetic number, because the mean of its divisors is an integer number (21272332801).

Almost surely, 2^42544665601 is an apocalyptic number.

It is an amenable number.

42544665601 is a deficient number, since it is larger than the sum of its proper divisors (1).

42544665601 is an equidigital number, since it uses as much as digits as its factorization.

42544665601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 42544665601 in words is "forty-two billion, five hundred forty-four million, six hundred sixty-five thousand, six hundred one".