1662035561 has 4 divisors (see below), whose sum is σ = 1665892224. Its totient is φ = 1658178900.

The previous prime is 1662035471. The next prime is 1662035569. The reversal of 1662035561 is 1655302661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1655302661 = 1667 ⋅992983.

It is a cyclic number.

It is not a de Polignac number, because 1662035561 - 2¹⁸ = 1661773417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1662035569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1927685 + ... + 1928546.

It is an arithmetic number, because the mean of its divisors is an integer number (416473056).

Almost surely, 2^1662035561 is an apocalyptic number.

It is an amenable number.

1662035561 is a deficient number, since it is larger than the sum of its proper divisors (3856663).

1662035561 is an equidigital number, since it uses as much as digits as its factorization.

1662035561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856662.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1662035561 is about 40768.0703614974. The cubic root of 1662035561 is about 1184.5319262052.

The spelling of 1662035561 in words is "one billion, six hundred sixty-two million, thirty-five thousand, five hundred sixty-one".