1149542297820 has 672 divisors, whose sum is σ = 4383927515520. Its totient is φ = 247478353920.

The previous prime is 1149542297797. The next prime is 1149542297851. The reversal of 1149542297820 is 287922459411.

1149542297820 is a `hidden beast` number, since 1 + 1 + 4 + 9 + 542 + 2 + 9 + 78 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 121344604 + ... + 121354076.

It is an arithmetic number, because the mean of its divisors is an integer number (6523701660).

Almost surely, 2^{1149542297820} is an apocalyptic number.

1149542297820 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 1149542297820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191963757760).

1149542297820 is an abundant number, since it is smaller than the sum of its proper divisors (3234385217700).

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

1149542297820 is a wasteful number, since it uses less digits than its factorization.

1149542297820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9577 (or 9560 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 1149542297820 in words is "one trillion, one hundred forty-nine billion, five hundred forty-two million, two hundred ninety-seven thousand, eight hundred twenty".