78286255981 has 2 divisors, whose sum is σ = 78286255982. Its totient is φ = 78286255980.

The previous prime is 78286255969. The next prime is 78286256047. The reversal of 78286255981 is 18955268287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73839366756 + 4446889225 = 271734^2 + 66685^2 .

It is a cyclic number.

It is not a de Polignac number, because 78286255981 - 2²³ = 78277867373 is a prime.

It is a super-2 number, since 2×78286255981² (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 (78286255381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39143127990 + 39143127991.

It is an arithmetic number, because the mean of its divisors is an integer number (39143127991).

Almost surely, 2^78286255981 is an apocalyptic number.

It is an amenable number.

78286255981 is a deficient number, since it is larger than the sum of its proper divisors (1).

78286255981 is an equidigital number, since it uses as much as digits as its factorization.

78286255981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19353600, while the sum is 61.

The spelling of 78286255981 in words is "seventy-eight billion, two hundred eighty-six million, two hundred fifty-five thousand, nine hundred eighty-one".