1155435797880 has 1280 divisors, whose sum is σ = 5236086240000. Its totient is φ = 221504274432.

The previous prime is 1155435797861. The next prime is 1155435797951. The reversal of 1155435797880 is 887975345511.

It is a happy number.

1155435797880 is a `hidden beast` number, since 1 + 1 + 5 + 54 + 3 + 579 + 7 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 145352146 + ... + 145360094.

It is an arithmetic number, because the mean of its divisors is an integer number (4090692375).

Almost surely, 2^{1155435797880} is an apocalyptic number.

1155435797880 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 1155435797880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2618043120000).

1155435797880 is an abundant number, since it is smaller than the sum of its proper divisors (4080650442120).

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

1155435797880 is a wasteful number, since it uses less digits than its factorization.

1155435797880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8038 (or 8025 counting only the distinct ones).

The product of its (nonzero) digits is 42336000, while the sum is 63.

The spelling of 1155435797880 in words is "one trillion, one hundred fifty-five billion, four hundred thirty-five million, seven hundred ninety-seven thousand, eight hundred eighty".