978339754657 has 4 divisors (see below), whose sum is σ = 989332336260. Its totient is φ = 967347173056.

The previous prime is 978339754643. The next prime is 978339754663. The reversal of 978339754657 is 756457933879.

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 353530133056 + 624809621601 = 594584^2 + 790449^2 .

It is a cyclic number.

It is not a de Polignac number, because 978339754657 - 2¹⁵ = 978339721889 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 978339754657.

It is not an unprimeable number, because it can be changed into a prime (978339754757) 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, 5496290668 + ... + 5496290845.

It is an arithmetic number, because the mean of its divisors is an integer number (247333084065).

Almost surely, 2^978339754657 is an apocalyptic number.

It is an amenable number.

978339754657 is a deficient number, since it is larger than the sum of its proper divisors (10992581603).

978339754657 is a wasteful number, since it uses less digits than its factorization.

978339754657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10992581602.

The product of its digits is 1200225600, while the sum is 73.

The spelling of 978339754657 in words is "nine hundred seventy-eight billion, three hundred thirty-nine million, seven hundred fifty-four thousand, six hundred fifty-seven".