1663055 has 4 divisors (see below), whose sum is σ = 1995672. Its totient is φ = 1330440.

The previous prime is 1663031. The next prime is 1663073. The reversal of 1663055 is 5503661.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1663055 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166301 + ... + 166310.

It is an arithmetic number, because the mean of its divisors is an integer number (498918).

2^1663055 is an apocalyptic number.

1663055 is a deficient number, since it is larger than the sum of its proper divisors (332617).

1663055 is an equidigital number, since it uses as much as digits as its factorization.

1663055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332616.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1663055 is about 1289.5948976326. The cubic root of 1663055 is about 118.4774061264.

Subtracting 1663055 from its reverse (5503661), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 1663055 in words is "one million, six hundred sixty-three thousand, fifty-five".