78953663 has 2 divisors, whose sum is σ = 78953664. Its totient is φ = 78953662.

The previous prime is 78953647. The next prime is 78953669. The reversal of 78953663 is 36635987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78953663 - 2⁴ = 78953647 is a prime.

It is a super-2 number, since 2×78953663² = 12467361802235138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78953669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39476831 + 39476832.

It is an arithmetic number, because the mean of its divisors is an integer number (39476832).

Almost surely, 2^78953663 is an apocalyptic number.

78953663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78953663 is an equidigital number, since it uses as much as digits as its factorization.

78953663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 78953663 is about 8885.5873750698. The cubic root of 78953663 is about 429.0001340281. Note that the first 3 decimals are identical.

The spelling of 78953663 in words is "seventy-eight million, nine hundred fifty-three thousand, six hundred sixty-three".