7779400778393 has 8 divisors (see below), whose sum is σ = 7895580373440. Its totient is φ = 7663223216880.

The previous prime is 7779400778363. The next prime is 7779400778411. The reversal of 7779400778393 is 3938770049777.

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 7779400778393 - 2²⁴ = 7779384001177 is a prime.

It is a super-2 number, since 2×7779400778393² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7779400778363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8341643 + ... + 9227231.

It is an arithmetic number, because the mean of its divisors is an integer number (986947546680).

Almost surely, 2^{7779400778393} is an apocalyptic number.

It is an amenable number.

7779400778393 is a deficient number, since it is larger than the sum of its proper divisors (116179595047).

7779400778393 is a wasteful number, since it uses less digits than its factorization.

7779400778393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016767.

The product of its (nonzero) digits is 392073696, while the sum is 71.

The spelling of 7779400778393 in words is "seven trillion, seven hundred seventy-nine billion, four hundred million, seven hundred seventy-eight thousand, three hundred ninety-three".