2001002566 has 8 divisors (see below), whose sum is σ = 3010154760. Its totient is φ = 997617648.

The previous prime is 2001002551. The next prime is 2001002567. The reversal of 2001002566 is 6652001002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2001002566² = 8008022538277168712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001002567) 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, 1440951 + ... + 1442338.

It is an arithmetic number, because the mean of its divisors is an integer number (376269345).

Almost surely, 2^2001002566 is an apocalyptic number.

2001002566 is a deficient number, since it is larger than the sum of its proper divisors (1009152194).

2001002566 is a wasteful number, since it uses less digits than its factorization.

2001002566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883638.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2001002566 is about 44732.5671742635. The cubic root of 2001002566 is about 1260.1315403949.

Adding to 2001002566 its reverse (6652001002), we get a palindrome (8653003568).

The spelling of 2001002566 in words is "two billion, one million, two thousand, five hundred sixty-six".