78813661366 has 16 divisors (see below), whose sum is σ = 128972337408. Its totient is φ = 35823133800.

The previous prime is 78813661361. The next prime is 78813661387. The reversal of 78813661366 is 66316631887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78813661361) 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, 917911 + ... + 1000093.

It is an arithmetic number, because the mean of its divisors is an integer number (8060771088).

Almost surely, 2^78813661366 is an apocalyptic number.

78813661366 is a deficient number, since it is larger than the sum of its proper divisors (50158676042).

78813661366 is a wasteful number, since it uses less digits than its factorization.

78813661366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125787.

The product of its digits is 5225472, while the sum is 55.

The spelling of 78813661366 in words is "seventy-eight billion, eight hundred thirteen million, six hundred sixty-one thousand, three hundred sixty-six".