1561146016 has 12 divisors (see below), whose sum is σ = 3073506282. Its totient is φ = 780572992.

The previous prime is 1561145983. The next prime is 1561146017. The reversal of 1561146016 is 6106411651.

It can be written as a sum of positive squares in only one way, i.e., 1022720400 + 538425616 = 31980^2 + 23204^2 .

It is not an unprimeable number, because it can be changed into a prime (1561146017) 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 as a sum of consecutive naturals, namely, 24392875 + ... + 24392938.

Almost surely, 2^1561146016 is an apocalyptic number.

1561146016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1561146016 is a deficient number, since it is larger than the sum of its proper divisors (1512360266).

1561146016 is an equidigital number, since it uses as much as digits as its factorization.

1561146016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48785823 (or 48785815 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1561146016 is about 39511.3403467916. The cubic root of 1561146016 is about 1160.0619308988.

Adding to 1561146016 its reverse (6106411651), we get a palindrome (7667557667).

The spelling of 1561146016 in words is "one billion, five hundred sixty-one million, one hundred forty-six thousand, sixteen".