78368179581 has 6 divisors (see below), whose sum is σ = 113198481630. Its totient is φ = 52245453048.

The previous prime is 78368179553. The next prime is 78368179597. The reversal of 78368179581 is 18597186387.

78368179581 is a `hidden beast` number, since 7 + 8 + 36 + 8 + 17 + 9 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 56307018681 + 22061160900 = 237291^2 + 148530^2 .

It is not a de Polignac number, because 78368179581 - 2¹⁰ = 78368178557 is a prime.

It is a super-3 number, since 3×78368179581³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78368179531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4353787746 + ... + 4353787763.

It is an arithmetic number, because the mean of its divisors is an integer number (18866413605).

Almost surely, 2^78368179581 is an apocalyptic number.

It is an amenable number.

78368179581 is a deficient number, since it is larger than the sum of its proper divisors (34830302049).

78368179581 is a wasteful number, since it uses less digits than its factorization.

78368179581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8707575515 (or 8707575512 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 78368179581 in words is "seventy-eight billion, three hundred sixty-eight million, one hundred seventy-nine thousand, five hundred eighty-one".