78842300549 has 4 divisors (see below), whose sum is σ = 79035069420. Its totient is φ = 78649531680.

The previous prime is 78842300489. The next prime is 78842300657. The reversal of 78842300549 is 94500324887.

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

It can be written as a sum of positive squares in 2 ways, for example, as 69603630625 + 9238669924 = 263825^2 + 96118^2 .

It is a cyclic number.

It is not a de Polignac number, because 78842300549 - 2⁸ = 78842300293 is a prime.

It is a super-2 number, since 2×78842300549² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78842300497 and 78842300506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78842300249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96383822 + ... + 96384639.

It is an arithmetic number, because the mean of its divisors is an integer number (19758767355).

Almost surely, 2^78842300549 is an apocalyptic number.

It is an amenable number.

78842300549 is a deficient number, since it is larger than the sum of its proper divisors (192768871).

78842300549 is a wasteful number, since it uses less digits than its factorization.

78842300549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192768870.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 78842300549 in words is "seventy-eight billion, eight hundred forty-two million, three hundred thousand, five hundred forty-nine".