1561516608 has 28 divisors (see below), whose sum is σ = 4131513200. Its totient is φ = 520505472.

The previous prime is 1561516559. The next prime is 1561516609. The reversal of 1561516608 is 8066151651.

It is not an unprimeable number, because it can be changed into a prime (1561516609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4066258 + ... + 4066641.

Almost surely, 2^1561516608 is an apocalyptic number.

It is an amenable number.

1561516608 is an abundant number, since it is smaller than the sum of its proper divisors (2569996592).

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

1561516608 is an equidigital number, since it uses as much as digits as its factorization.

1561516608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8132914 (or 8132904 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 1561516608 is about 39516.0297600860. The cubic root of 1561516608 is about 1160.1537172432.

It can be divided in two parts, 15615 and 16608, that added together give a palindrome (32223).

The spelling of 1561516608 in words is "one billion, five hundred sixty-one million, five hundred sixteen thousand, six hundred eight".