838642663 has 2 divisors, whose sum is σ = 838642664. Its totient is φ = 838642662.

The previous prime is 838642643. The next prime is 838642681. The reversal of 838642663 is 366246838.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 838642663 - 2²¹ = 836545511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838642603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419321331 + 419321332.

It is an arithmetic number, because the mean of its divisors is an integer number (419321332).

Almost surely, 2^838642663 is an apocalyptic number.

838642663 is a deficient number, since it is larger than the sum of its proper divisors (1).

838642663 is an equidigital number, since it uses as much as digits as its factorization.

838642663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 46.

The square root of 838642663 is about 28959.3277373630. The cubic root of 838642663 is about 943.0303077471.

The spelling of 838642663 in words is "eight hundred thirty-eight million, six hundred forty-two thousand, six hundred sixty-three".