1966490256665 has 8 divisors (see below), whose sum is σ = 2574314517888. Its totient is φ = 1430174732080.

The previous prime is 1966490256649. The next prime is 1966490256673. The reversal of 1966490256665 is 5666520946691.

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

It is not a de Polignac number, because 1966490256665 - 2⁴ = 1966490256649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17877184097 + ... + 17877184206.

It is an arithmetic number, because the mean of its divisors is an integer number (321789314736).

Almost surely, 2^{1966490256665} is an apocalyptic number.

It is an amenable number.

1966490256665 is a deficient number, since it is larger than the sum of its proper divisors (607824261223).

1966490256665 is a wasteful number, since it uses less digits than its factorization.

1966490256665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35754368319.

The product of its (nonzero) digits is 125971200, while the sum is 65.

The spelling of 1966490256665 in words is "one trillion, nine hundred sixty-six billion, four hundred ninety million, two hundred fifty-six thousand, six hundred sixty-five".