42439619965 has 4 divisors (see below), whose sum is σ = 50927543964. Its totient is φ = 33951695968.

The previous prime is 42439619947. The next prime is 42439619983. The reversal of 42439619965 is 56991693424.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42439619947) and next prime (42439619983).

It can be written as a sum of positive squares in 2 ways, for example, as 9611253369 + 32828366596 = 98037^2 + 181186^2 .

It is a cyclic number.

It is not a de Polignac number, because 42439619965 - 2⁷ = 42439619837 is a prime.

It is a super-5 number, since 5×42439619965⁵ (a number of 54 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4243961992 + ... + 4243962001.

It is an arithmetic number, because the mean of its divisors is an integer number (12731885991).

Almost surely, 2^42439619965 is an apocalyptic number.

It is an amenable number.

42439619965 is a deficient number, since it is larger than the sum of its proper divisors (8487923999).

42439619965 is an equidigital number, since it uses as much as digits as its factorization.

42439619965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8487923998.

The product of its digits is 12597120, while the sum is 58.

The spelling of 42439619965 in words is "forty-two billion, four hundred thirty-nine million, six hundred nineteen thousand, nine hundred sixty-five".