1566501138 has 24 divisors (see below), whose sum is σ = 3444746448. Its totient is φ = 514373112.

The previous prime is 1566501133. The next prime is 1566501179. The reversal of 1566501138 is 8311056651.

1566501138 is a `hidden beast` number, since 1 + 566 + 50 + 11 + 38 = 666.

It is not an unprimeable number, because it can be changed into a prime (1566501133) 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 11 ways as a sum of consecutive naturals, for example, 648256 + ... + 650667.

It is an arithmetic number, because the mean of its divisors is an integer number (143531102).

Almost surely, 2^1566501138 is an apocalyptic number.

1566501138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1566501138 is an abundant number, since it is smaller than the sum of its proper divisors (1878245310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1566501138 is a wasteful number, since it uses less digits than its factorization.

1566501138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298998 (or 1298995 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1566501138 is about 39579.0492306220. The cubic root of 1566501138 is about 1161.3868514789.

Adding to 1566501138 its reverse (8311056651), we get a palindrome (9877557789).

The spelling of 1566501138 in words is "one billion, five hundred sixty-six million, five hundred one thousand, one hundred thirty-eight".