1662541609 has 32 divisors (see below), whose sum is σ = 1815609600. Its totient is φ = 1519015680.

The previous prime is 1662541583. The next prime is 1662541651. The reversal of 1662541609 is 9061452661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1662541609 - 2¹³ = 1662533417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1662541679) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10589359 + ... + 10589515.

It is an arithmetic number, because the mean of its divisors is an integer number (56737800).

Almost surely, 2^1662541609 is an apocalyptic number.

It is an amenable number.

1662541609 is a deficient number, since it is larger than the sum of its proper divisors (153067991).

1662541609 is a wasteful number, since it uses less digits than its factorization.

1662541609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1662541609 is about 40774.2763148532. The cubic root of 1662541609 is about 1184.6521340595.

The spelling of 1662541609 in words is "one billion, six hundred sixty-two million, five hundred forty-one thousand, six hundred nine".