1664061 has 8 divisors (see below), whose sum is σ = 2535744. Its totient is φ = 950880.

The previous prime is 1664053. The next prime is 1664063. The reversal of 1664061 is 1604661.

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

It is not a de Polignac number, because 1664061 - 2³ = 1664053 is a prime.

1664061 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39600 + ... + 39641.

It is an arithmetic number, because the mean of its divisors is an integer number (316968).

2^1664061 is an apocalyptic number.

It is an amenable number.

1664061 is a deficient number, since it is larger than the sum of its proper divisors (871683).

1664061 is an equidigital number, since it uses as much as digits as its factorization.

1664061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79251.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1664061 is about 1289.9848836324. The cubic root of 1664061 is about 118.5012907335.

The spelling of 1664061 in words is "one million, six hundred sixty-four thousand, sixty-one".