991535695392 has 192 divisors, whose sum is σ = 3032062709760. Its totient is φ = 280746009600.

The previous prime is 991535695387. The next prime is 991535695417. The reversal of 991535695392 is 293596535199.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427123 + ... + 1471565.

It is an arithmetic number, because the mean of its divisors is an integer number (15791993280).

Almost surely, 2^991535695392 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 991535695392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516031354880).

991535695392 is an abundant number, since it is smaller than the sum of its proper divisors (2040527014368).

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

991535695392 is a wasteful number, since it uses less digits than its factorization.

991535695392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044527 (or 1044519 counting only the distinct ones).

The product of its digits is 88573500, while the sum is 66.

The spelling of 991535695392 in words is "nine hundred ninety-one billion, five hundred thirty-five million, six hundred ninety-five thousand, three hundred ninety-two".