1566216407 has 4 divisors (see below), whose sum is σ = 1789961616. Its totient is φ = 1342471200.

The previous prime is 1566216371. The next prime is 1566216439. The reversal of 1566216407 is 7046126651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7046126651 = 887 ⋅7943773.

It is not a de Polignac number, because 1566216407 - 2¹² = 1566212311 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 (1566216467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111872594 + ... + 111872607.

It is an arithmetic number, because the mean of its divisors is an integer number (447490404).

Almost surely, 2^1566216407 is an apocalyptic number.

1566216407 is a deficient number, since it is larger than the sum of its proper divisors (223745209).

1566216407 is an equidigital number, since it uses as much as digits as its factorization.

1566216407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223745208.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1566216407 is about 39575.4520757502. The cubic root of 1566216407 is about 1161.3164817297.

The spelling of 1566216407 in words is "one billion, five hundred sixty-six million, two hundred sixteen thousand, four hundred seven".