978510078013 has 4 divisors (see below), whose sum is σ = 1053780084028. Its totient is φ = 903240072000.

The previous prime is 978510077989. The next prime is 978510078083. The reversal of 978510078013 is 310870015879.

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

It can be written as a sum of positive squares in 2 ways, for example, as 58700567524 + 919809510489 = 242282^2 + 959067^2 .

It is a cyclic number.

It is not a de Polignac number, because 978510078013 - 2⁵ = 978510077981 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 (978510078083) 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, 37635002988 + ... + 37635003013.

It is an arithmetic number, because the mean of its divisors is an integer number (263445021007).

Almost surely, 2^978510078013 is an apocalyptic number.

It is an amenable number.

978510078013 is a deficient number, since it is larger than the sum of its proper divisors (75270006015).

978510078013 is a wasteful number, since it uses less digits than its factorization.

978510078013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75270006014.

The product of its (nonzero) digits is 423360, while the sum is 49.

The spelling of 978510078013 in words is "nine hundred seventy-eight billion, five hundred ten million, seventy-eight thousand, thirteen".