1662189985 has 8 divisors (see below), whose sum is σ = 1995520680. Its totient is φ = 1329156864.

The previous prime is 1662189959. The next prime is 1662189989. The reversal of 1662189985 is 5899812661.

It can be written as a sum of positive squares in 4 ways, for example, as 1382976 + 1660807009 = 1176^2 + 40753^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1662189985 - 2⁵ = 1662189953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1662189989) 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, 61912 + ... + 84601.

It is an arithmetic number, because the mean of its divisors is an integer number (249440085).

Almost surely, 2^1662189985 is an apocalyptic number.

It is an amenable number.

1662189985 is a deficient number, since it is larger than the sum of its proper divisors (333330695).

1662189985 is a wasteful number, since it uses less digits than its factorization.

1662189985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148787.

The product of its digits is 1866240, while the sum is 55.

The square root of 1662189985 is about 40769.9642506588. The cubic root of 1662189985 is about 1184.5686110387.

The spelling of 1662189985 in words is "one billion, six hundred sixty-two million, one hundred eighty-nine thousand, nine hundred eighty-five".