1566500001 has 24 divisors (see below), whose sum is σ = 2318592192. Its totient is φ = 939972000.

The previous prime is 1566499951. The next prime is 1566500017. The reversal of 1566500001 is 1000056651.

It is not a de Polignac number, because 1566500001 - 2⁹ = 1566499489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1566500021) 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 23 ways as a sum of consecutive naturals, for example, 15300 + ... + 58026.

It is an arithmetic number, because the mean of its divisors is an integer number (96608008).

Almost surely, 2^1566500001 is an apocalyptic number.

1566500001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1566500001 is a deficient number, since it is larger than the sum of its proper divisors (752092191).

1566500001 is a wasteful number, since it uses less digits than its factorization.

1566500001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42853 (or 42842 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1566500001 is about 39579.0348669596. The cubic root of 1566500001 is about 1161.3865704924.

Adding to 1566500001 its reverse (1000056651), we get a palindrome (2566556652).

The spelling of 1566500001 in words is "one billion, five hundred sixty-six million, five hundred thousand, one".