1561530016 has 24 divisors (see below), whose sum is σ = 3173433984. Its totient is φ = 755578560.

The previous prime is 1561530013. The next prime is 1561530023. The reversal of 1561530016 is 6100351651.

It is not an unprimeable number, because it can be changed into a prime (1561530013) 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, 786070 + ... + 788053.

It is an arithmetic number, because the mean of its divisors is an integer number (132226416).

Almost surely, 2^1561530016 is an apocalyptic number.

1561530016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561530016 is an abundant number, since it is smaller than the sum of its proper divisors (1611903968).

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

1561530016 is a wasteful number, since it uses less digits than its factorization.

1561530016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574164 (or 1574156 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1561530016 is about 39516.1994123929. The cubic root of 1561530016 is about 1160.1570377963.

Adding to 1561530016 its reverse (6100351651), we get a palindrome (7661881667).

The spelling of 1561530016 in words is "one billion, five hundred sixty-one million, five hundred thirty thousand, sixteen".