1666244302436 has 144 divisors (see below), whose sum is σ = 3541210928640. Its totient is φ = 683160791040.

The previous prime is 1666244302399. The next prime is 1666244302439. The reversal of 1666244302436 is 6342034426661.

It is a happy number.

It is a super-3 number, since 3×1666244302436³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666244302439) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 642591956 + ... + 642594548.

It is an arithmetic number, because the mean of its divisors is an integer number (24591742560).

Almost surely, 2^{1666244302436} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666244302436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1770605464320).

1666244302436 is an abundant number, since it is smaller than the sum of its proper divisors (1874966626204).

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

1666244302436 is a wasteful number, since it uses less digits than its factorization.

1666244302436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 47.

The spelling of 1666244302436 in words is "one trillion, six hundred sixty-six billion, two hundred forty-four million, three hundred two thousand, four hundred thirty-six".