66650442 has 32 divisors (see below), whose sum is σ = 141419520. Its totient is φ = 20882160.

The previous prime is 66650401. The next prime is 66650443. The reversal of 66650442 is 24405666.

It is not an unprimeable number, because it can be changed into a prime (66650443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12703 + ... + 17165.

It is an arithmetic number, because the mean of its divisors is an integer number (4419360).

Almost surely, 2^66650442 is an apocalyptic number.

66650442 is an abundant number, since it is smaller than the sum of its proper divisors (74769078).

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

66650442 is a wasteful number, since it uses less digits than its factorization.

66650442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 66650442 is about 8163.9721949551. The cubic root of 66650442 is about 405.4472364694.

The spelling of 66650442 in words is "sixty-six million, six hundred fifty thousand, four hundred forty-two".