1663205401 has 16 divisors (see below), whose sum is σ = 1956951360. Its totient is φ = 1393571520.

The previous prime is 1663205381. The next prime is 1663205429. The reversal of 1663205401 is 1045023661.

It is not a de Polignac number, because 1663205401 - 2¹³ = 1663197209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1663205401.

It is not an unprimeable number, because it can be changed into a prime (1663205431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89155 + ... + 106183.

It is an arithmetic number, because the mean of its divisors is an integer number (122309460).

Almost surely, 2^1663205401 is an apocalyptic number.

1663205401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1663205401 is a deficient number, since it is larger than the sum of its proper divisors (293745959).

1663205401 is a wasteful number, since it uses less digits than its factorization.

1663205401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17736.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1663205401 is about 40782.4153404381. The cubic root of 1663205401 is about 1184.8097758238.

The spelling of 1663205401 in words is "one billion, six hundred sixty-three million, two hundred five thousand, four hundred one".