8678078236621 has 2 divisors, whose sum is σ = 8678078236622. Its totient is φ = 8678078236620.

The previous prime is 8678078236609. The next prime is 8678078236631. The reversal of 8678078236621 is 1266328708768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7336676476900 + 1341401759721 = 2708630^2 + 1158189^2 .

It is a cyclic number.

It is not a de Polignac number, because 8678078236621 - 2⁹ = 8678078236109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8678078236631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4339039118310 + 4339039118311.

It is an arithmetic number, because the mean of its divisors is an integer number (4339039118311).

Almost surely, 2^{8678078236621} is an apocalyptic number.

It is an amenable number.

8678078236621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8678078236621 is an equidigital number, since it uses as much as digits as its factorization.

8678078236621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65028096, while the sum is 64.

The spelling of 8678078236621 in words is "eight trillion, six hundred seventy-eight billion, seventy-eight million, two hundred thirty-six thousand, six hundred twenty-one".