42144420709 has 2 divisors, whose sum is σ = 42144420710. Its totient is φ = 42144420708.

The previous prime is 42144420629. The next prime is 42144420727. The reversal of 42144420709 is 90702444124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34708807809 + 7435612900 = 186303^2 + 86230^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144420709 - 2¹¹ = 42144418661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42144420749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21072210354 + 21072210355.

It is an arithmetic number, because the mean of its divisors is an integer number (21072210355).

Almost surely, 2^42144420709 is an apocalyptic number.

It is an amenable number.

42144420709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144420709 is an equidigital number, since it uses as much as digits as its factorization.

42144420709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

The spelling of 42144420709 in words is "forty-two billion, one hundred forty-four million, four hundred twenty thousand, seven hundred nine".