978989556911 has 8 divisors (see below), whose sum is σ = 1003873277904. Its totient is φ = 954153737280.

The previous prime is 978989556761. The next prime is 978989557031. The reversal of 978989556911 is 119655989879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978989556911 is a prime.

It is a super-2 number, since 2×978989556911² (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 (978989552911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11933945 + ... + 12015698.

It is an arithmetic number, because the mean of its divisors is an integer number (125484159738).

Almost surely, 2^978989556911 is an apocalyptic number.

978989556911 is a deficient number, since it is larger than the sum of its proper divisors (24883720993).

978989556911 is a wasteful number, since it uses less digits than its factorization.

978989556911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23950681.

The product of its digits is 440899200, while the sum is 77.

The spelling of 978989556911 in words is "nine hundred seventy-eight billion, nine hundred eighty-nine million, five hundred fifty-six thousand, nine hundred eleven".