9771159139920 has 1120 divisors, whose sum is σ = 37436302078080. Its totient is φ = 2361808834560.

The previous prime is 9771159139877. The next prime is 9771159139979. The reversal of 9771159139920 is 299319511779.

9771159139920 is a `hidden beast` number, since 9 + 7 + 7 + 1 + 1 + 591 + 39 + 9 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 2500934607 + ... + 2500938513.

Almost surely, 2^{9771159139920} is an apocalyptic number.

9771159139920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9771159139920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18718151039040).

9771159139920 is an abundant number, since it is smaller than the sum of its proper divisors (27665142938160).

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

9771159139920 is a wasteful number, since it uses less digits than its factorization.

9771159139920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055 (or 4034 counting only the distinct ones).

The product of its (nonzero) digits is 9644670, while the sum is 63.

The spelling of 9771159139920 in words is "nine trillion, seven hundred seventy-one billion, one hundred fifty-nine million, one hundred thirty-nine thousand, nine hundred twenty".