66706542 has 72 divisors (see below), whose sum is σ = 171419976. Its totient is φ = 18686304.

The previous prime is 66706501. The next prime is 66706547. The reversal of 66706542 is 24560766.

It is a junction number, because it is equal to n+sod(n) for n = 66706497 and 66706506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66706547) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46033 + ... + 47459.

It is an arithmetic number, because the mean of its divisors is an integer number (2380833).

Almost surely, 2^66706542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66706542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85709988).

66706542 is an abundant number, since it is smaller than the sum of its proper divisors (104713434).

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

66706542 is a wasteful number, since it uses less digits than its factorization.

66706542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1492 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 66706542 is about 8167.4072997494. The cubic root of 66706542 is about 405.5609602026.

The spelling of 66706542 in words is "sixty-six million, seven hundred six thousand, five hundred forty-two".