66891087463 has 2 divisors, whose sum is σ = 66891087464. Its totient is φ = 66891087462.

The previous prime is 66891087457. The next prime is 66891087521. The reversal of 66891087463 is 36478019866.

It is a happy number.

It is an a-pointer prime, because the next prime (66891087521) can be obtained adding 66891087463 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66891087463 - 2¹³ = 66891079271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66891087398 and 66891087407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66891088463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33445543731 + 33445543732.

It is an arithmetic number, because the mean of its divisors is an integer number (33445543732).

Almost surely, 2^66891087463 is an apocalyptic number.

66891087463 is a deficient number, since it is larger than the sum of its proper divisors (1).

66891087463 is an equidigital number, since it uses as much as digits as its factorization.

66891087463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 66891087463 in words is "sixty-six billion, eight hundred ninety-one million, eighty-seven thousand, four hundred sixty-three".