663540105 has 16 divisors (see below), whose sum is σ = 1087559424. Its totient is φ = 345256320.

The previous prime is 663540103. The next prime is 663540121. The reversal of 663540105 is 501045366.

It is not a de Polignac number, because 663540105 - 2¹ = 663540103 is a prime.

It is a super-2 number, since 2×663540105² = 880570941886822050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663540103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538849 + ... + 540078.

It is an arithmetic number, because the mean of its divisors is an integer number (67972464).

Almost surely, 2^663540105 is an apocalyptic number.

It is an amenable number.

663540105 is a deficient number, since it is larger than the sum of its proper divisors (424019319).

663540105 is a wasteful number, since it uses less digits than its factorization.

663540105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078976.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 663540105 is about 25759.2722140980. The cubic root of 663540105 is about 872.2126726626.

The spelling of 663540105 in words is "six hundred sixty-three million, five hundred forty thousand, one hundred five".