991066182288 has 320 divisors, whose sum is σ = 3271609270272. Its totient is φ = 251480401920.

The previous prime is 991066182287. The next prime is 991066182307. The reversal of 991066182288 is 882281660199.

It is a super-2 number, since 2×991066182288² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991066182287) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23404431 + ... + 23446737.

Almost surely, 2^991066182288 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 991066182288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1635804635136).

991066182288 is an abundant number, since it is smaller than the sum of its proper divisors (2280543087984).

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

991066182288 is a wasteful number, since it uses less digits than its factorization.

991066182288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42542 (or 42536 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 60.

The spelling of 991066182288 in words is "nine hundred ninety-one billion, sixty-six million, one hundred eighty-two thousand, two hundred eighty-eight".