1501666 has 8 divisors (see below), whose sum is σ = 2307564. Its totient is φ = 732480.

The previous prime is 1501663. The next prime is 1501667. The reversal of 1501666 is 6661051.

It can be written as a sum of positive squares in 2 ways, for example, as 1256641 + 245025 = 1121^2 + 495^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1501666.

It is not an unprimeable number, because it can be changed into a prime (1501663) 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, 9075 + ... + 9238.

2^1501666 is an apocalyptic number.

1501666 is a deficient number, since it is larger than the sum of its proper divisors (805898).

1501666 is a wasteful number, since it uses less digits than its factorization.

1501666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18356.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1501666 is about 1225.4248242956. The cubic root of 1501666 is about 114.5137884401.

The spelling of 1501666 in words is "one million, five hundred one thousand, six hundred sixty-six".