1129565876778 has 112 divisors (see below), whose sum is σ = 2554283289600. Its totient is φ = 374462339040.

The previous prime is 1129565876767. The next prime is 1129565876779. The reversal of 1129565876778 is 8776785659211.

1129565876778 is a `hidden beast` number, since 11 + 29 + 5 + 6 + 587 + 6 + 7 + 7 + 8 = 666.

It is a super-2 number, since 2×1129565876778² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1129565876779) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 504494583 + ... + 504496821.

It is an arithmetic number, because the mean of its divisors is an integer number (22806100800).

Almost surely, 2^{1129565876778} is an apocalyptic number.

1129565876778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1129565876778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1277141644800).

1129565876778 is an abundant number, since it is smaller than the sum of its proper divisors (1424717412822).

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

1129565876778 is a wasteful number, since it uses less digits than its factorization.

1129565876778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999 (or 3984 counting only the distinct ones).

The product of its digits is 355622400, while the sum is 72.

The spelling of 1129565876778 in words is "one trillion, one hundred twenty-nine billion, five hundred sixty-five million, eight hundred seventy-six thousand, seven hundred seventy-eight".