978781763556 has 243 divisors, whose sum is σ = 2668265682537. Its totient is φ = 314133331680.

The previous prime is 978781763551. The next prime is 978781763567. The reversal of 978781763556 is 655367187879.

The square root of 978781763556 is 989334.

It is a perfect power (a square), and thus also a powerful number.

978781763556 is a `hidden beast` number, since 9 + 7 + 8 + 7 + 8 + 1 + 7 + 63 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 959008904100 + 19772859456 = 979290^2 + 140616^2 .

It is a tau number, because it is divible by the number of its divisors (243).

It is not an unprimeable number, because it can be changed into a prime (978781763551) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4968435250 + ... + 4968435446.

Almost surely, 2^978781763556 is an apocalyptic number.

978781763556 is the 989334-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978781763556

978781763556 is an abundant number, since it is smaller than the sum of its proper divisors (1689483918981).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

978781763556 is an frugal number, since it uses more digits than its factorization.

978781763556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 233 counting only the distinct ones).

The product of its digits is 533433600, while the sum is 72.

The spelling of 978781763556 in words is "nine hundred seventy-eight billion, seven hundred eighty-one million, seven hundred sixty-three thousand, five hundred fifty-six".