42088665617 has 2 divisors, whose sum is σ = 42088665618. Its totient is φ = 42088665616.

The previous prime is 42088665607. The next prime is 42088665679. The reversal of 42088665617 is 71656688024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23505795856 + 18582869761 = 153316^2 + 136319^2 .

It is a cyclic number.

It is not a de Polignac number, because 42088665617 - 2³⁴ = 24908796433 is a prime.

It is not a weakly prime, because it can be changed into another prime (42088665607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21044332808 + 21044332809.

It is an arithmetic number, because the mean of its divisors is an integer number (21044332809).

Almost surely, 2^42088665617 is an apocalyptic number.

It is an amenable number.

42088665617 is a deficient number, since it is larger than the sum of its proper divisors (1).

42088665617 is an equidigital number, since it uses as much as digits as its factorization.

42088665617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 42088665617 in words is "forty-two billion, eighty-eight million, six hundred sixty-five thousand, six hundred seventeen".