78774809369 has 4 divisors (see below), whose sum is σ = 78776155920. Its totient is φ = 78773462820.

The previous prime is 78774809363. The next prime is 78774809417. The reversal of 78774809369 is 96390847787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78774809369 - 2¹² = 78774805273 is a prime.

It is a super-5 number, since 5×78774809369⁵ (a number of 56 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 junction number, because it is equal to n+sod(n) for n = 78774809299 and 78774809308.

It is not an unprimeable number, because it can be changed into a prime (78774809363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581339 + ... + 703920.

It is an arithmetic number, because the mean of its divisors is an integer number (19694038980).

Almost surely, 2^78774809369 is an apocalyptic number.

It is an amenable number.

78774809369 is a deficient number, since it is larger than the sum of its proper divisors (1346551).

78774809369 is a wasteful number, since it uses less digits than its factorization.

78774809369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346550.

The product of its (nonzero) digits is 128024064, while the sum is 68.

The spelling of 78774809369 in words is "seventy-eight billion, seven hundred seventy-four million, eight hundred nine thousand, three hundred sixty-nine".