78042842109 has 12 divisors (see below), whose sum is σ = 112762680576. Its totient is φ = 52012808712.

The previous prime is 78042842077. The next prime is 78042842161. The reversal of 78042842109 is 90124824087.

78042842109 is a `hidden beast` number, since 7 + 8 + 0 + 428 + 4 + 210 + 9 = 666.

It is not a de Polignac number, because 78042842109 - 2⁵ = 78042842077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78042142109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1281309 + ... + 1340834.

It is an arithmetic number, because the mean of its divisors is an integer number (9396890048).

Almost surely, 2^78042842109 is an apocalyptic number.

It is an amenable number.

78042842109 is a deficient number, since it is larger than the sum of its proper divisors (34719838467).

78042842109 is a wasteful number, since it uses less digits than its factorization.

78042842109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625456 (or 2625453 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 78042842109 in words is "seventy-eight billion, forty-two million, eight hundred forty-two thousand, one hundred nine".