1663661677 has 4 divisors (see below), whose sum is σ = 1674679456. Its totient is φ = 1652643900.

The previous prime is 1663661609. The next prime is 1663661689. The reversal of 1663661677 is 7761663661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1663661677 - 2¹¹ = 1663659629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663661677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663661177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5508663 + ... + 5508964.

It is an arithmetic number, because the mean of its divisors is an integer number (418669864).

Almost surely, 2^1663661677 is an apocalyptic number.

It is an amenable number.

1663661677 is a deficient number, since it is larger than the sum of its proper divisors (11017779).

1663661677 is a wasteful number, since it uses less digits than its factorization.

1663661677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11017778.

The product of its digits is 1143072, while the sum is 49.

The square root of 1663661677 is about 40788.0089854849. The cubic root of 1663661677 is about 1184.9181109773.

The spelling of 1663661677 in words is "one billion, six hundred sixty-three million, six hundred sixty-one thousand, six hundred seventy-seven".