978189636465 has 48 divisors (see below), whose sum is σ = 1758451076928. Its totient is φ = 521664048576.

The previous prime is 978189636461. The next prime is 978189636553. The reversal of 978189636465 is 564636981879.

978189636465 is a `hidden beast` number, since 9 + 7 + 81 + 89 + 6 + 3 + 6 + 465 = 666.

It is not a de Polignac number, because 978189636465 - 2² = 978189636461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 978189636393 and 978189636402.

It is not an unprimeable number, because it can be changed into a prime (978189636461) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 30209374 + ... + 30241736.

It is an arithmetic number, because the mean of its divisors is an integer number (36634397436).

Almost surely, 2^978189636465 is an apocalyptic number.

It is an amenable number.

978189636465 is a deficient number, since it is larger than the sum of its proper divisors (780261440463).

978189636465 is a wasteful number, since it uses less digits than its factorization.

978189636465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57260 (or 57248 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 72.

The spelling of 978189636465 in words is "nine hundred seventy-eight billion, one hundred eighty-nine million, six hundred thirty-six thousand, four hundred sixty-five".