1566117013 has 4 divisors (see below), whose sum is σ = 1566428428. Its totient is φ = 1565805600.

The previous prime is 1566117011. The next prime is 1566117023. The reversal of 1566117013 is 3107116651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3107116651 = 7151 ⋅434501.

It can be written as a sum of positive squares in 2 ways, for example, as 662393169 + 903723844 = 25737^2 + 30062^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566117013 - 2¹ = 1566117011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566117011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148038 + ... + 158263.

It is an arithmetic number, because the mean of its divisors is an integer number (391607107).

Almost surely, 2^1566117013 is an apocalyptic number.

It is an amenable number.

1566117013 is a deficient number, since it is larger than the sum of its proper divisors (311415).

1566117013 is an equidigital number, since it uses as much as digits as its factorization.

1566117013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311414.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 1566117013 is about 39574.1963026414. The cubic root of 1566117013 is about 1161.2919150241.

The spelling of 1566117013 in words is "one billion, five hundred sixty-six million, one hundred seventeen thousand, thirteen".