1946666491 has 8 divisors (see below), whose sum is σ = 2427012864. Its totient is φ = 1516882920.

The previous prime is 1946666471. The next prime is 1946666497.

1946666491 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1946666491 - 2⁷ = 1946666363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1946666497) 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, 12640615 + ... + 12640768.

It is an arithmetic number, because the mean of its divisors is an integer number (303376608).

Almost surely, 2^1946666491 is an apocalyptic number.

1946666491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1946666491 is a deficient number, since it is larger than the sum of its proper divisors (480346373).

1946666491 is a wasteful number, since it uses less digits than its factorization.

1946666491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25281401.

The product of its digits is 1679616, while the sum is 52.

The square root of 1946666491 is about 44121.0436299959. The cubic root of 1946666491 is about 1248.6206632506.

The spelling of 1946666491 in words is "one billion, nine hundred forty-six million, six hundred sixty-six thousand, four hundred ninety-one".