1065661466880 has 432 divisors, whose sum is σ = 3625018334784. Its totient is φ = 266751836160.

The previous prime is 1065661466843. The next prime is 1065661466939. The reversal of 1065661466880 is 886641665601.

It is a super-2 number, since 2×1065661466880² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1065661466880.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 511598319 + ... + 511600401.

Almost surely, 2^{1065661466880} is an apocalyptic number.

1065661466880 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 1065661466880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812509167392).

1065661466880 is an abundant number, since it is smaller than the sum of its proper divisors (2559356867904).

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

1065661466880 is a wasteful number, since it uses less digits than its factorization.

1065661466880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602 (or 2571 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 1065661466880 in words is "one trillion, sixty-five billion, six hundred sixty-one million, four hundred sixty-six thousand, eight hundred eighty".