1661933867 has 8 divisors (see below), whose sum is σ = 1813358640. Its totient is φ = 1510565760.

The previous prime is 1661933863. The next prime is 1661933873. The reversal of 1661933867 is 7683391661.

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

It is not a de Polignac number, because 1661933867 - 2² = 1661933863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661933863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67823 + ... + 89015.

It is an arithmetic number, because the mean of its divisors is an integer number (226669830).

Almost surely, 2^1661933867 is an apocalyptic number.

1661933867 is a deficient number, since it is larger than the sum of its proper divisors (151424773).

1661933867 is a wasteful number, since it uses less digits than its factorization.

1661933867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28333.

The product of its digits is 979776, while the sum is 50.

The square root of 1661933867 is about 40766.8231163528. The cubic root of 1661933867 is about 1184.5077666246.

The spelling of 1661933867 in words is "one billion, six hundred sixty-one million, nine hundred thirty-three thousand, eight hundred sixty-seven".