1001666472 has 64 divisors (see below), whose sum is σ = 2641267200. Its totient is φ = 315679680.

The previous prime is 1001666461. The next prime is 1001666473. The reversal of 1001666472 is 2746661001.

It is a super-2 number, since 2×1001666472² = 2006671442257853568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1001666473) 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 15 ways as a sum of consecutive naturals, for example, 258453 + ... + 262299.

It is an arithmetic number, because the mean of its divisors is an integer number (41269800).

Almost surely, 2^1001666472 is an apocalyptic number.

1001666472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001666472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1320633600).

1001666472 is an abundant number, since it is smaller than the sum of its proper divisors (1639600728).

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

1001666472 is a wasteful number, since it uses less digits than its factorization.

1001666472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446 (or 4442 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1001666472 is about 31649.1148691397. The cubic root of 1001666472 is about 1000.5551823821. Note that the first 3 decimals are identical.

The spelling of 1001666472 in words is "one billion, one million, six hundred sixty-six thousand, four hundred seventy-two".