978575609999 has 4 divisors (see below), whose sum is σ = 1053850656936. Its totient is φ = 903300563064.

The previous prime is 978575609959. The next prime is 978575610079. The reversal of 978575609999 is 999906575879.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 978575609999 - 2³² = 974280642703 is a prime.

It is a super-2 number, since 2×978575609999² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978575609939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37637523449 + ... + 37637523474.

It is an arithmetic number, because the mean of its divisors is an integer number (263462664234).

Almost surely, 2^978575609999 is an apocalyptic number.

978575609999 is a deficient number, since it is larger than the sum of its proper divisors (75275046937).

978575609999 is a wasteful number, since it uses less digits than its factorization.

978575609999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75275046936.

The product of its (nonzero) digits is 3472081200, while the sum is 83.

The spelling of 978575609999 in words is "nine hundred seventy-eight billion, five hundred seventy-five million, six hundred nine thousand, nine hundred ninety-nine".