1661112867 has 8 divisors (see below), whose sum is σ = 2331386560. Its totient is φ = 1049123880.

The previous prime is 1661112863. The next prime is 1661112907. The reversal of 1661112867 is 7682111661.

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

It is not a de Polignac number, because 1661112867 - 2² = 1661112863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661112863) 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, 14571109 + ... + 14571222.

It is an arithmetic number, because the mean of its divisors is an integer number (291423320).

Almost surely, 2^1661112867 is an apocalyptic number.

1661112867 is a deficient number, since it is larger than the sum of its proper divisors (670273693).

1661112867 is a wasteful number, since it uses less digits than its factorization.

1661112867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29142353.

The product of its digits is 24192, while the sum is 39.

The square root of 1661112867 is about 40756.7524098768. The cubic root of 1661112867 is about 1184.3126844424.

The spelling of 1661112867 in words is "one billion, six hundred sixty-one million, one hundred twelve thousand, eight hundred sixty-seven".