1561166013 has 16 divisors (see below), whose sum is σ = 2283921216. Its totient is φ = 940688640.

The previous prime is 1561166011. The next prime is 1561166017. The reversal of 1561166013 is 3106611651.

It is not a de Polignac number, because 1561166013 - 2¹ = 1561166011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561166011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131020 + ... + 142437.

It is an arithmetic number, because the mean of its divisors is an integer number (142745076).

Almost surely, 2^1561166013 is an apocalyptic number.

It is an amenable number.

1561166013 is a deficient number, since it is larger than the sum of its proper divisors (722755203).

1561166013 is a wasteful number, since it uses less digits than its factorization.

1561166013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273644.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1561166013 is about 39511.5933999124. The cubic root of 1561166013 is about 1160.0668840250.

Adding to 1561166013 its reverse (3106611651), we get a palindrome (4667777664).

The spelling of 1561166013 in words is "one billion, five hundred sixty-one million, one hundred sixty-six thousand, thirteen".