1109685666544 has 720 divisors, whose sum is σ = 2935724673024. Its totient is φ = 404190259200.

The previous prime is 1109685666527. The next prime is 1109685666563. The reversal of 1109685666544 is 4456665869011.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 10773647197 + ... + 10773647299.

Almost surely, 2^{1109685666544} is an apocalyptic number.

1109685666544 is a gapful number since it is divisible by the number (14) 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 1109685666544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1467862336512).

1109685666544 is an abundant number, since it is smaller than the sum of its proper divisors (1826039006480).

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

1109685666544 is a wasteful number, since it uses less digits than its factorization.

1109685666544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 1109685666544 in words is "one trillion, one hundred nine billion, six hundred eighty-five million, six hundred sixty-six thousand, five hundred forty-four".