981791555472 has 360 divisors, whose sum is σ = 3411565020864. Its totient is φ = 258076855296.

The previous prime is 981791555471. The next prime is 981791555477. The reversal of 981791555472 is 274555197189.

981791555472 is a `hidden beast` number, since 9 + 8 + 1 + 7 + 9 + 1 + 5 + 554 + 72 = 666.

It is a super-2 number, since 2×981791555472² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (981791555471) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 52288678 + ... + 52307450.

Almost surely, 2^981791555472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 981791555472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705782510432).

981791555472 is an abundant number, since it is smaller than the sum of its proper divisors (2429773465392).

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

981791555472 is a wasteful number, since it uses less digits than its factorization.

981791555472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19127 (or 19105 counting only the distinct ones).

The product of its digits is 31752000, while the sum is 63.

The spelling of 981791555472 in words is "nine hundred eighty-one billion, seven hundred ninety-one million, five hundred fifty-five thousand, four hundred seventy-two".