1661047675 has 12 divisors (see below), whose sum is σ = 2353942096. Its totient is φ = 1139004000.

The previous prime is 1661047667. The next prime is 1661047693. The reversal of 1661047675 is 5767401661.

It is not a de Polignac number, because 1661047675 - 2³ = 1661047667 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4745676 + ... + 4746025.

Almost surely, 2^1661047675 is an apocalyptic number.

1661047675 is a deficient number, since it is larger than the sum of its proper divisors (692894421).

1661047675 is an equidigital number, since it uses as much as digits as its factorization.

1661047675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9491718 (or 9491713 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 1661047675 is about 40755.9526327137. The cubic root of 1661047675 is about 1184.2971910696.

The spelling of 1661047675 in words is "one billion, six hundred sixty-one million, forty-seven thousand, six hundred seventy-five".