1661677419 has 4 divisors (see below), whose sum is σ = 2215569896. Its totient is φ = 1107784944.

The previous prime is 1661677411. The next prime is 1661677439. The reversal of 1661677419 is 9147761661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9147761661 = 3 ⋅3049253887.

It is not a de Polignac number, because 1661677419 - 2³ = 1661677411 is a prime.

It is a super-2 number, since 2×1661677419² = 5522343689629003122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661677411) 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, 276946234 + ... + 276946239.

It is an arithmetic number, because the mean of its divisors is an integer number (553892474).

Almost surely, 2^1661677419 is an apocalyptic number.

1661677419 is a deficient number, since it is larger than the sum of its proper divisors (553892477).

1661677419 is an equidigital number, since it uses as much as digits as its factorization.

1661677419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553892476.

The product of its digits is 381024, while the sum is 48.

The square root of 1661677419 is about 40763.6776922789. The cubic root of 1661677419 is about 1184.4468375508.

The spelling of 1661677419 in words is "one billion, six hundred sixty-one million, six hundred seventy-seven thousand, four hundred nineteen".