1566356413 has 4 divisors (see below), whose sum is σ = 1567450908. Its totient is φ = 1565261920.

The previous prime is 1566356377. The next prime is 1566356459. The reversal of 1566356413 is 3146536651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3146536651 = 1907 ⋅1649993.

It can be written as a sum of positive squares in 2 ways, for example, as 1316020729 + 250335684 = 36277^2 + 15822^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566356413 - 2¹³ = 1566348221 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 (1566350413) 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, 545098 + ... + 547963.

It is an arithmetic number, because the mean of its divisors is an integer number (391862727).

Almost surely, 2^1566356413 is an apocalyptic number.

It is an amenable number.

1566356413 is a deficient number, since it is larger than the sum of its proper divisors (1094495).

1566356413 is a wasteful number, since it uses less digits than its factorization.

1566356413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094494.

The product of its digits is 194400, while the sum is 40.

The square root of 1566356413 is about 39577.2208852517. The cubic root of 1566356413 is about 1161.3510845321.

The spelling of 1566356413 in words is "one billion, five hundred sixty-six million, three hundred fifty-six thousand, four hundred thirteen".