66743442 has 36 divisors (see below), whose sum is σ = 149803290. Its totient is φ = 21475776.

The previous prime is 66743437. The next prime is 66743461. The reversal of 66743442 is 24434766.

It can be written as a sum of positive squares in 3 ways, for example, as 44076321 + 22667121 = 6639^2 + 4761^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66743397 and 66743406.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12934 + ... + 17342.

Almost surely, 2^66743442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66743442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74901645).

66743442 is an abundant number, since it is smaller than the sum of its proper divisors (83059848).

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

66743442 is a wasteful number, since it uses less digits than its factorization.

66743442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475 (or 4443 counting only the distinct ones).

The product of its digits is 96768, while the sum is 36.

The square root of 66743442 is about 8169.6659662437. The cubic root of 66743442 is about 405.6357276862.

The spelling of 66743442 in words is "sixty-six million, seven hundred forty-three thousand, four hundred forty-two".