981418663 has 2 divisors, whose sum is σ = 981418664. Its totient is φ = 981418662.

The previous prime is 981418661. The next prime is 981418727. The reversal of 981418663 is 366814189.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981418663 - 2¹ = 981418661 is a prime.

Together with 981418661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981418661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490709331 + 490709332.

It is an arithmetic number, because the mean of its divisors is an integer number (490709332).

Almost surely, 2^981418663 is an apocalyptic number.

981418663 is a deficient number, since it is larger than the sum of its proper divisors (1).

981418663 is an equidigital number, since it uses as much as digits as its factorization.

981418663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 981418663 is about 31327.6022542422. The cubic root of 981418663 is about 993.7674571093.

It can be divided in two parts, 981418 and 663, that added together give a square (982081 = 991²).

The spelling of 981418663 in words is "nine hundred eighty-one million, four hundred eighteen thousand, six hundred sixty-three".