1663672689629 has 8 divisors (see below), whose sum is σ = 1675572876600. Its totient is φ = 1651782297600.

The previous prime is 1663672689619. The next prime is 1663672689733. The reversal of 1663672689629 is 9269862763661.

It can be written as a sum of positive squares in 4 ways, for example, as 252561528025 + 1411111161604 = 502555^2 + 1187902^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1663672689629 - 2¹⁶ = 1663672624093 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 (1663672689619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2107652 + ... + 2787389.

It is an arithmetic number, because the mean of its divisors is an integer number (209446609575).

Almost surely, 2^{1663672689629} is an apocalyptic number.

It is an amenable number.

1663672689629 is a deficient number, since it is larger than the sum of its proper divisors (11900186971).

1663672689629 is a wasteful number, since it uses less digits than its factorization.

1663672689629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4897471.

The product of its digits is 423263232, while the sum is 71.

The spelling of 1663672689629 in words is "one trillion, six hundred sixty-three billion, six hundred seventy-two million, six hundred eighty-nine thousand, six hundred twenty-nine".