666638091463 has 2 divisors, whose sum is σ = 666638091464. Its totient is φ = 666638091462.

The previous prime is 666638091407. The next prime is 666638091563. The reversal of 666638091463 is 364190836666.

666638091463 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666638091463 - 2²⁵ = 666604537031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666638091398 and 666638091407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666638091563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333319045731 + 333319045732.

It is an arithmetic number, because the mean of its divisors is an integer number (333319045732).

Almost surely, 2^666638091463 is an apocalyptic number.

666638091463 is a deficient number, since it is larger than the sum of its proper divisors (1).

666638091463 is an equidigital number, since it uses as much as digits as its factorization.

666638091463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20155392, while the sum is 58.

The spelling of 666638091463 in words is "six hundred sixty-six billion, six hundred thirty-eight million, ninety-one thousand, four hundred sixty-three".