11978663 has 2 divisors, whose sum is σ = 11978664. Its totient is φ = 11978662.

The previous prime is 11978657. The next prime is 11978671. The reversal of 11978663 is 36687911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11978663 - 2⁴ = 11978647 is a prime.

It is equal to p₇₈₆₇₅₈ and since 11978663 and 786758 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11978663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11978063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989331 + 5989332.

It is an arithmetic number, because the mean of its divisors is an integer number (5989332).

Almost surely, 2^11978663 is an apocalyptic number.

11978663 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978663 is an equidigital number, since it uses as much as digits as its factorization.

11978663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 11978663 is about 3461.0205142414. The cubic root of 11978663 is about 228.8070748521.

The spelling of 11978663 in words is "eleven million, nine hundred seventy-eight thousand, six hundred sixty-three".