1161720299520 has 1360 divisors, whose sum is σ = 4768534945152. Its totient is φ = 267827281920.

The previous prime is 1161720299473. The next prime is 1161720299539. The reversal of 1161720299520 is 259920271611.

1161720299520 is a `hidden beast` number, since 1 + 1 + 6 + 17 + 20 + 2 + 99 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6715146154 + ... + 6715146326.

Almost surely, 2^{1161720299520} is an apocalyptic number.

1161720299520 is a gapful number since it is divisible by the number (10) 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 1161720299520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384267472576).

1161720299520 is an abundant number, since it is smaller than the sum of its proper divisors (3606814645632).

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

1161720299520 is an equidigital number, since it uses as much as digits as its factorization.

1161720299520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The spelling of 1161720299520 in words is "one trillion, one hundred sixty-one billion, seven hundred twenty million, two hundred ninety-nine thousand, five hundred twenty".