1663353540 has 72 divisors (see below), whose sum is σ = 5050963008. Its totient is φ = 443081280.

The previous prime is 1663353529. The next prime is 1663353599. The reversal of 1663353540 is 453533661.

1663353540 is a `hidden beast` number, since 1 + 6 + 63 + 3 + 53 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1663353495 and 1663353504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181099 + ... + 190061.

It is an arithmetic number, because the mean of its divisors is an integer number (70152264).

Almost surely, 2^1663353540 is an apocalyptic number.

1663353540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663353540 is an abundant number, since it is smaller than the sum of its proper divisors (3387609468).

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

1663353540 is a wasteful number, since it uses less digits than its factorization.

1663353540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009 (or 10004 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The square root of 1663353540 is about 40784.2315117007. The cubic root of 1663353540 is about 1184.8449511394.

The spelling of 1663353540 in words is "one billion, six hundred sixty-three million, three hundred fifty-three thousand, five hundred forty".