78366066387 has 16 divisors (see below), whose sum is σ = 126439368192. Its totient is φ = 42146455680.

The previous prime is 78366066307. The next prime is 78366066481.

78366066387 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78366066387 - 2¹⁰ = 78366065363 is a prime.

It is a super-2 number, since 2×78366066387² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78366066387.

It is not an unprimeable number, because it can be changed into a prime (78366066307) 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, 109756039 + ... + 109756752.

It is an arithmetic number, because the mean of its divisors is an integer number (7902460512).

Almost surely, 2^78366066387 is an apocalyptic number.

78366066387 is a deficient number, since it is larger than the sum of its proper divisors (48073301805).

78366066387 is a wasteful number, since it uses less digits than its factorization.

78366066387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219512818.

The product of its (nonzero) digits is 36578304, while the sum is 60.

The spelling of 78366066387 in words is "seventy-eight billion, three hundred sixty-six million, sixty-six thousand, three hundred eighty-seven".