663544379 has 2 divisors, whose sum is σ = 663544380. Its totient is φ = 663544378.

The previous prime is 663544373. The next prime is 663544403. The reversal of 663544379 is 973445366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663544379 - 2⁴ = 663544363 is a prime.

It is a super-2 number, since 2×663544379² = 880582285804991282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663544373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331772189 + 331772190.

It is an arithmetic number, because the mean of its divisors is an integer number (331772190).

Almost surely, 2^663544379 is an apocalyptic number.

663544379 is a deficient number, since it is larger than the sum of its proper divisors (1).

663544379 is an equidigital number, since it uses as much as digits as its factorization.

663544379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 47.

The square root of 663544379 is about 25759.3551743828. The cubic root of 663544379 is about 872.2145453597.

The spelling of 663544379 in words is "six hundred sixty-three million, five hundred forty-four thousand, three hundred seventy-nine".