78586068581 has 2 divisors, whose sum is σ = 78586068582. Its totient is φ = 78586068580.

The previous prime is 78586068577. The next prime is 78586068647. The reversal of 78586068581 is 18586068587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52686316225 + 25899752356 = 229535^2 + 160934^2 .

It is a cyclic number.

It is not a de Polignac number, because 78586068581 - 2² = 78586068577 is a prime.

It is a super-2 number, since 2×78586068581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78586068481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39293034290 + 39293034291.

It is an arithmetic number, because the mean of its divisors is an integer number (39293034291).

Almost surely, 2^78586068581 is an apocalyptic number.

It is an amenable number.

78586068581 is a deficient number, since it is larger than the sum of its proper divisors (1).

78586068581 is an equidigital number, since it uses as much as digits as its factorization.

78586068581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25804800, while the sum is 62.

The spelling of 78586068581 in words is "seventy-eight billion, five hundred eighty-six million, sixty-eight thousand, five hundred eighty-one".