991158053760 has 192 divisors, whose sum is σ = 3911534621280. Its totient is φ = 226550403072.

The previous prime is 991158053737. The next prime is 991158053761. The reversal of 991158053760 is 67350851199.

991158053760 is a `hidden beast` number, since 9 + 9 + 1 + 1 + 580 + 53 + 7 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×991158053760² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991158053697 and 991158053706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991158053761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12250827 + ... + 12331466.

Almost surely, 2^991158053760 is an apocalyptic number.

991158053760 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

991158053760 is an abundant number, since it is smaller than the sum of its proper divisors (2920376567520).

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

991158053760 is a wasteful number, since it uses less digits than its factorization.

991158053760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24582325 (or 24582310 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 991158053760 in words is "nine hundred ninety-one billion, one hundred fifty-eight million, fifty-three thousand, seven hundred sixty".