78396109165305 has 16 divisors (see below), whose sum is σ = 139370860738560. Its totient is φ = 41811258221424.

The previous prime is 78396109165303. The next prime is 78396109165343. The reversal of 78396109165305 is 50356190169387.

78396109165305 is a `hidden beast` number, since 7 + 8 + 3 + 9 + 6 + 1 + 0 + 91 + 6 + 530 + 5 = 666.

It is not a de Polignac number, because 78396109165305 - 2¹ = 78396109165303 is a prime.

It is a super-2 number, since 2×78396109165305² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78396109165303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290355959737 + ... + 290355960006.

It is an arithmetic number, because the mean of its divisors is an integer number (8710678796160).

Almost surely, 2^{78396109165305} is an apocalyptic number.

It is an amenable number.

78396109165305 is a deficient number, since it is larger than the sum of its proper divisors (60974751573255).

78396109165305 is a wasteful number, since it uses less digits than its factorization.

78396109165305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580711919757 (or 580711919751 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 63.

The spelling of 78396109165305 in words is "seventy-eight trillion, three hundred ninety-six billion, one hundred nine million, one hundred sixty-five thousand, three hundred five".