1663793121 has 8 divisors (see below), whose sum is σ = 2335148320. Its totient is φ = 1050816672.

The previous prime is 1663793081. The next prime is 1663793123. The reversal of 1663793121 is 1213973661.

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

It is not a de Polignac number, because 1663793121 - 2⁶ = 1663793057 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 1663793121.

It is not an unprimeable number, because it can be changed into a prime (1663793123) 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, 14594620 + ... + 14594733.

It is an arithmetic number, because the mean of its divisors is an integer number (291893540).

Almost surely, 2^1663793121 is an apocalyptic number.

It is an amenable number.

1663793121 is a deficient number, since it is larger than the sum of its proper divisors (671355199).

1663793121 is a wasteful number, since it uses less digits than its factorization.

1663793121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29189375.

The product of its digits is 40824, while the sum is 39.

The square root of 1663793121 is about 40789.6202605516. The cubic root of 1663793121 is about 1184.9493164956.

The spelling of 1663793121 in words is "one billion, six hundred sixty-three million, seven hundred ninety-three thousand, one hundred twenty-one".