78535563842 has 18 divisors (see below), whose sum is σ = 119528743347. Its totient is φ = 38700843300.

The previous prime is 78535563817. The next prime is 78535563947. The reversal of 78535563842 is 24836553587.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39267781921 + 39267781921 = 198161^2 + 198161^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=198161.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 28137467 + ... + 28140257.

Almost surely, 2^78535563842 is an apocalyptic number.

78535563842 is a deficient number, since it is larger than the sum of its proper divisors (40993179505).

78535563842 is an frugal number, since it uses more digits than its factorization.

78535563842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726 (or 2864 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 56.

The spelling of 78535563842 in words is "seventy-eight billion, five hundred thirty-five million, five hundred sixty-three thousand, eight hundred forty-two".