978771538771 has 16 divisors (see below), whose sum is σ = 1067580259200. Its totient is φ = 891897821568.

The previous prime is 978771538757. The next prime is 978771538799. The reversal of 978771538771 is 177835177879.

It is a happy number.

It is not a de Polignac number, because 978771538771 - 2¹³ = 978771530579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 978771538771.

It is not an unprimeable number, because it can be changed into a prime (978771530771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6412125 + ... + 6562993.

It is an arithmetic number, because the mean of its divisors is an integer number (66723766200).

Almost surely, 2^978771538771 is an apocalyptic number.

978771538771 is a deficient number, since it is larger than the sum of its proper divisors (88808720429).

978771538771 is a wasteful number, since it uses less digits than its factorization.

978771538771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157278.

The product of its digits is 145212480, while the sum is 70.

The spelling of 978771538771 in words is "nine hundred seventy-eight billion, seven hundred seventy-one million, five hundred thirty-eight thousand, seven hundred seventy-one".