1663463538 has 96 divisors (see below), whose sum is σ = 4099567680. Its totient is φ = 482993280.

The previous prime is 1663463533. The next prime is 1663463539. The reversal of 1663463538 is 8353643661.

1663463538 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 4 + 635 + 3 + 8 = 666.

It is a super-2 number, since 2×1663463538² = 5534221884510954888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1663463493 and 1663463502.

It is not an unprimeable number, because it can be changed into a prime (1663463531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 489148 + ... + 492536.

It is an arithmetic number, because the mean of its divisors is an integer number (42703830).

Almost surely, 2^1663463538 is an apocalyptic number.

1663463538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663463538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2049783840).

1663463538 is an abundant number, since it is smaller than the sum of its proper divisors (2436104142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663463538 is a wasteful number, since it uses less digits than its factorization.

1663463538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3509 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 1663463538 is about 40785.5800252982. The cubic root of 1663463538 is about 1184.8710685980.

The spelling of 1663463538 in words is "one billion, six hundred sixty-three million, four hundred sixty-three thousand, five hundred thirty-eight".