1663187727 has 16 divisors (see below), whose sum is σ = 2310133760. Its totient is φ = 1063173600.

The previous prime is 1663187717. The next prime is 1663187737. The reversal of 1663187727 is 7277813661.

It is an interprime number because it is at equal distance from previous prime (1663187717) and next prime (1663187737).

It is not a de Polignac number, because 1663187727 - 2⁶ = 1663187663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663187717) 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, 71899 + ... + 92172.

It is an arithmetic number, because the mean of its divisors is an integer number (144383360).

Almost surely, 2^1663187727 is an apocalyptic number.

1663187727 is a deficient number, since it is larger than the sum of its proper divisors (646946033).

1663187727 is a wasteful number, since it uses less digits than its factorization.

1663187727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164214.

The product of its digits is 592704, while the sum is 48.

The square root of 1663187727 is about 40782.1986533340. The cubic root of 1663187727 is about 1184.8055790276.

The spelling of 1663187727 in words is "one billion, six hundred sixty-three million, one hundred eighty-seven thousand, seven hundred twenty-seven".