78427686473 has 2 divisors, whose sum is σ = 78427686474. Its totient is φ = 78427686472.

The previous prime is 78427686443. The next prime is 78427686497. The reversal of 78427686473 is 37468672487.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60352766224 + 18074920249 = 245668^2 + 134443^2 .

It is a cyclic number.

It is not a de Polignac number, because 78427686473 - 2⁶ = 78427686409 is a prime.

It is a super-3 number, since 3×78427686473³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (78427686443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39213843236 + 39213843237.

It is an arithmetic number, because the mean of its divisors is an integer number (39213843237).

Almost surely, 2^78427686473 is an apocalyptic number.

It is an amenable number.

78427686473 is a deficient number, since it is larger than the sum of its proper divisors (1).

78427686473 is an equidigital number, since it uses as much as digits as its factorization.

78427686473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75866112, while the sum is 62.

The spelling of 78427686473 in words is "seventy-eight billion, four hundred twenty-seven million, six hundred eighty-six thousand, four hundred seventy-three".