1563631616 has 56 divisors (see below), whose sum is σ = 3148943664. Its totient is φ = 776355840.

The previous prime is 1563631577. The next prime is 1563631639. The reversal of 1563631616 is 6161363651.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1563631616.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1334711 + ... + 1335881.

Almost surely, 2^1563631616 is an apocalyptic number.

1563631616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1563631616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574471832).

1563631616 is an abundant number, since it is smaller than the sum of its proper divisors (1585312048).

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

1563631616 is an equidigital number, since it uses as much as digits as its factorization.

1563631616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1336 counting only the distinct ones).

The product of its digits is 58320, while the sum is 38.

The square root of 1563631616 is about 39542.7820973689. The cubic root of 1563631616 is about 1160.6772739332.

The spelling of 1563631616 in words is "one billion, five hundred sixty-three million, six hundred thirty-one thousand, six hundred sixteen".