1566163406 has 4 divisors (see below), whose sum is σ = 2349245112. Its totient is φ = 783081702.

The previous prime is 1566163399. The next prime is 1566163427. The reversal of 1566163406 is 6043616651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6043616651 = 1019 ⋅5930929.

It is a self number, because there is not a number n which added to its sum of digits gives 1566163406.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 391540850 + ... + 391540853.

It is an arithmetic number, because the mean of its divisors is an integer number (587311278).

Almost surely, 2^1566163406 is an apocalyptic number.

1566163406 is a deficient number, since it is larger than the sum of its proper divisors (783081706).

1566163406 is an equidigital number, since it uses as much as digits as its factorization.

1566163406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783081705.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1566163406 is about 39574.7824504444. The cubic root of 1566163406 is about 1161.3033818735.

The spelling of 1566163406 in words is "one billion, five hundred sixty-six million, one hundred sixty-three thousand, four hundred six".