1663016401 has 4 divisors (see below), whose sum is σ = 1750543600. Its totient is φ = 1575489204.

The previous prime is 1663016387. The next prime is 1663016419. The reversal of 1663016401 is 1046103661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1046103661 = 3323 ⋅314807.

It is a cyclic number.

It is not a de Polignac number, because 1663016401 - 2⁷ = 1663016273 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 1663016401.

It is not an unprimeable number, because it can be changed into a prime (1663016441) 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, 43763571 + ... + 43763608.

It is an arithmetic number, because the mean of its divisors is an integer number (437635900).

Almost surely, 2^1663016401 is an apocalyptic number.

It is an amenable number.

1663016401 is a deficient number, since it is larger than the sum of its proper divisors (87527199).

1663016401 is an equidigital number, since it uses as much as digits as its factorization.

1663016401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87527198.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1663016401 is about 40780.0980994406. The cubic root of 1663016401 is about 1184.7648951113.

The spelling of 1663016401 in words is "one billion, six hundred sixty-three million, sixteen thousand, four hundred one".