1663672763661 has 8 divisors (see below), whose sum is σ = 2240193028704. Its totient is φ = 1098133837200.

The previous prime is 1663672763603. The next prime is 1663672763719.

It is a happy number.

1663672763661 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1663672763603) and next prime (1663672763719).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663672763661 - 2⁹ = 1663672763149 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1663672763595 and 1663672763604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663672753661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2745334291 + ... + 2745334896.

It is an arithmetic number, because the mean of its divisors is an integer number (280024128588).

Almost surely, 2^{1663672763661} is an apocalyptic number.

It is an amenable number.

1663672763661 is a deficient number, since it is larger than the sum of its proper divisors (576520265043).

1663672763661 is a wasteful number, since it uses less digits than its factorization.

1663672763661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490669291.

The product of its digits is 41150592, while the sum is 60.

The spelling of 1663672763661 in words is "one trillion, six hundred sixty-three billion, six hundred seventy-two million, seven hundred sixty-three thousand, six hundred sixty-one".