978718663 has 4 divisors (see below), whose sum is σ = 1054004728. Its totient is φ = 903432600.

The previous prime is 978718627. The next prime is 978718681. The reversal of 978718663 is 366817879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366817879 = 71 ⋅5166449.

It is a cyclic number.

It is not a de Polignac number, because 978718663 - 2¹⁷ = 978587591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978718603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37643013 + ... + 37643038.

It is an arithmetic number, because the mean of its divisors is an integer number (263501182).

Almost surely, 2^978718663 is an apocalyptic number.

978718663 is a deficient number, since it is larger than the sum of its proper divisors (75286065).

978718663 is a wasteful number, since it uses less digits than its factorization.

978718663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75286064.

The product of its digits is 3048192, while the sum is 55.

The square root of 978718663 is about 31284.4795865298. The cubic root of 978718663 is about 992.8552957729.

The spelling of 978718663 in words is "nine hundred seventy-eight million, seven hundred eighteen thousand, six hundred sixty-three".