991052355072 has 320 divisors, whose sum is σ = 2869558211520. Its totient is φ = 302140882944.

The previous prime is 991052355071. The next prime is 991052355109. The reversal of 991052355072 is 270553250199.

991052355072 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991052355071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1288754304 + ... + 1288755072.

It is an arithmetic number, because the mean of its divisors is an integer number (8967369411).

Almost surely, 2^991052355072 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 991052355072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434779105760).

991052355072 is an abundant number, since it is smaller than the sum of its proper divisors (1878505856448).

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

991052355072 is a wasteful number, since it uses less digits than its factorization.

991052355072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 850500, while the sum is 48.

The spelling of 991052355072 in words is "nine hundred ninety-one billion, fifty-two million, three hundred fifty-five thousand, seventy-two".