78219217441 has 4 divisors (see below), whose sum is σ = 78790160772. Its totient is φ = 77648274112.

The previous prime is 78219217403. The next prime is 78219217477. The reversal of 78219217441 is 14471291287.

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 54319294225 + 23899923216 = 233065^2 + 154596^2 .

It is a cyclic number.

It is not a de Polignac number, because 78219217441 - 2¹³ = 78219209249 is a prime.

It is a super-2 number, since 2×78219217441² (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 = 78219217391 and 78219217400.

It is not an unprimeable number, because it can be changed into a prime (78219217481) 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, 285471460 + ... + 285471733.

It is an arithmetic number, because the mean of its divisors is an integer number (19697540193).

Almost surely, 2^78219217441 is an apocalyptic number.

It is an amenable number.

78219217441 is a deficient number, since it is larger than the sum of its proper divisors (570943331).

78219217441 is a wasteful number, since it uses less digits than its factorization.

78219217441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570943330.

The product of its digits is 225792, while the sum is 46.

The spelling of 78219217441 in words is "seventy-eight billion, two hundred nineteen million, two hundred seventeen thousand, four hundred forty-one".