978656449665 has 16 divisors (see below), whose sum is σ = 1568028153600. Its totient is φ = 521224161792.

The previous prime is 978656449619. The next prime is 978656449747. The reversal of 978656449665 is 566944656879.

It is not a de Polignac number, because 978656449665 - 2⁹ = 978656449153 is a prime.

It is a super-2 number, since 2×978656449665² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45360400 + ... + 45381969.

It is an arithmetic number, because the mean of its divisors is an integer number (98001759600).

Almost surely, 2^978656449665 is an apocalyptic number.

It is an amenable number.

978656449665 is a deficient number, since it is larger than the sum of its proper divisors (589371703935).

978656449665 is a wasteful number, since it uses less digits than its factorization.

978656449665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90743096.

The product of its digits is 2351462400, while the sum is 75.

The spelling of 978656449665 in words is "nine hundred seventy-eight billion, six hundred fifty-six million, four hundred forty-nine thousand, six hundred sixty-five".