16666401275 has 6 divisors (see below), whose sum is σ = 20666337612. Its totient is φ = 13333121000.

The previous prime is 16666401259. The next prime is 16666401281. The reversal of 16666401275 is 57210466661.

It is not a de Polignac number, because 16666401275 - 2⁴ = 16666401259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333328001 + ... + 333328050.

It is an arithmetic number, because the mean of its divisors is an integer number (3444389602).

Almost surely, 2^16666401275 is an apocalyptic number.

16666401275 is a deficient number, since it is larger than the sum of its proper divisors (3999936337).

16666401275 is an equidigital number, since it uses as much as digits as its factorization.

16666401275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666656061 (or 666656056 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 16666401275 in words is "sixteen billion, six hundred sixty-six million, four hundred one thousand, two hundred seventy-five".