1661323085 has 8 divisors (see below), whose sum is σ = 1996003296. Its totient is φ = 1327448080.

The previous prime is 1661323021. The next prime is 1661323109. The reversal of 1661323085 is 5803231661.

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

It is not a de Polignac number, because 1661323085 - 2⁶ = 1661323021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196751 + ... + 205020.

It is an arithmetic number, because the mean of its divisors is an integer number (249500412).

Almost surely, 2^1661323085 is an apocalyptic number.

It is an amenable number.

1661323085 is a deficient number, since it is larger than the sum of its proper divisors (334680211).

1661323085 is an equidigital number, since it uses as much as digits as its factorization.

1661323085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402603.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1661323085 is about 40759.3312629145. The cubic root of 1661323085 is about 1184.3626415820.

The spelling of 1661323085 in words is "one billion, six hundred sixty-one million, three hundred twenty-three thousand, eighty-five".