1663033922421 has 4 divisors (see below), whose sum is σ = 2217378563232. Its totient is φ = 1108689281612.

The previous prime is 1663033922393. The next prime is 1663033922507. The reversal of 1663033922421 is 1242293303661.

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 1663033922421 - 2⁶ = 1663033922357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663033922321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277172320401 + ... + 277172320406.

It is an arithmetic number, because the mean of its divisors is an integer number (554344640808).

Almost surely, 2^{1663033922421} is an apocalyptic number.

It is an amenable number.

1663033922421 is a deficient number, since it is larger than the sum of its proper divisors (554344640811).

1663033922421 is an equidigital number, since it uses as much as digits as its factorization.

1663033922421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554344640810.

The product of its (nonzero) digits is 279936, while the sum is 42.

The spelling of 1663033922421 in words is "one trillion, six hundred sixty-three billion, thirty-three million, nine hundred twenty-two thousand, four hundred twenty-one".