66458394 has 40 divisors (see below), whose sum is σ = 149554548. Its totient is φ = 22057920.

The previous prime is 66458387. The next prime is 66458407. The reversal of 66458394 is 49385466.

66458394 is a `hidden beast` number, since 6 + 64 + 583 + 9 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63441225 + 3017169 = 7965^2 + 1737^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44134 + ... + 45614.

Almost surely, 2^66458394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66458394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74777274).

66458394 is an abundant number, since it is smaller than the sum of its proper divisors (83096154).

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

66458394 is a wasteful number, since it uses less digits than its factorization.

66458394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772 (or 1763 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 66458394 is about 8152.2017884741. The cubic root of 66458394 is about 405.0574404126.

The spelling of 66458394 in words is "sixty-six million, four hundred fifty-eight thousand, three hundred ninety-four".