1663211493 has 24 divisors (see below), whose sum is σ = 2531050080. Its totient is φ = 1049539680.

The previous prime is 1663211483. The next prime is 1663211503. The reversal of 1663211493 is 3941123661.

1663211493 is a `hidden beast` number, since 1 + 6 + 632 + 1 + 14 + 9 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (1663211483) and next prime (1663211503).

It is not a de Polignac number, because 1663211493 - 2⁴ = 1663211477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663211483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232630 + ... + 239672.

It is an arithmetic number, because the mean of its divisors is an integer number (105460420).

Almost surely, 2^1663211493 is an apocalyptic number.

It is an amenable number.

1663211493 is a deficient number, since it is larger than the sum of its proper divisors (867838587).

1663211493 is a wasteful number, since it uses less digits than its factorization.

1663211493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8449 (or 8446 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1663211493 is about 40782.4900294232. The cubic root of 1663211493 is about 1184.8112223984.

The spelling of 1663211493 in words is "one billion, six hundred sixty-three million, two hundred eleven thousand, four hundred ninety-three".