978544675793 has 4 divisors (see below), whose sum is σ = 978724660020. Its totient is φ = 978364691568.

The previous prime is 978544675753. The next prime is 978544675811. The reversal of 978544675793 is 397576445879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397576445879 = 359 ⋅1107455281.

It can be written as a sum of positive squares in 2 ways, for example, as 393270714769 + 585273961024 = 627113^2 + 765032^2 .

It is a cyclic number.

It is not a de Polignac number, because 978544675793 - 2³⁶ = 909825199057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 978544675793.

It is not an unprimeable number, because it can be changed into a prime (978544675723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89983958 + ... + 89994831.

It is an arithmetic number, because the mean of its divisors is an integer number (244681165005).

Almost surely, 2^978544675793 is an apocalyptic number.

It is an amenable number.

978544675793 is a deficient number, since it is larger than the sum of its proper divisors (179984227).

978544675793 is a wasteful number, since it uses less digits than its factorization.

978544675793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179984226.

The product of its digits is 1600300800, while the sum is 74.

The spelling of 978544675793 in words is "nine hundred seventy-eight billion, five hundred forty-four million, six hundred seventy-five thousand, seven hundred ninety-three".