1663568455 has 4 divisors (see below), whose sum is σ = 1996282152. Its totient is φ = 1330854760.

The previous prime is 1663568429. The next prime is 1663568471. The reversal of 1663568455 is 5548653661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5548653661 = 44809 ⋅123829.

It is not a de Polignac number, because 1663568455 - 2⁷ = 1663568327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663568399 and 1663568408.

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, 166356841 + ... + 166356850.

It is an arithmetic number, because the mean of its divisors is an integer number (499070538).

Almost surely, 2^1663568455 is an apocalyptic number.

1663568455 is a deficient number, since it is larger than the sum of its proper divisors (332713697).

1663568455 is an equidigital number, since it uses as much as digits as its factorization.

1663568455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332713696.

The product of its digits is 2592000, while the sum is 49.

The square root of 1663568455 is about 40786.8662071506. The cubic root of 1663568455 is about 1184.8959785729.

The spelling of 1663568455 in words is "one billion, six hundred sixty-three million, five hundred sixty-eight thousand, four hundred fifty-five".