7778138413817 has 8 divisors (see below), whose sum is σ = 7794246371424. Its totient is φ = 7762035174048.

The previous prime is 7778138413811. The next prime is 7778138413841. The reversal of 7778138413817 is 7183148318777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7778138413817 - 2¹⁸ = 7778138151673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7778138413811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2130893 + ... + 4482965.

It is an arithmetic number, because the mean of its divisors is an integer number (974280796428).

Almost surely, 2^{7778138413817} is an apocalyptic number.

It is an amenable number.

7778138413817 is a deficient number, since it is larger than the sum of its proper divisors (16107957607).

7778138413817 is a wasteful number, since it uses less digits than its factorization.

7778138413817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358919.

The product of its digits is 44255232, while the sum is 65.

The spelling of 7778138413817 in words is "seven trillion, seven hundred seventy-eight billion, one hundred thirty-eight million, four hundred thirteen thousand, eight hundred seventeen".