66189650 has 24 divisors (see below), whose sum is σ = 127087104. Its totient is φ = 25621200.

The previous prime is 66189649. The next prime is 66189659. The reversal of 66189650 is 5698166.

It is a junction number, because it is equal to n+sod(n) for n = 66189598 and 66189607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66189659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19802 + ... + 22901.

It is an arithmetic number, because the mean of its divisors is an integer number (5295296).

Almost surely, 2^66189650 is an apocalyptic number.

66189650 is a deficient number, since it is larger than the sum of its proper divisors (60897454).

66189650 is a wasteful number, since it uses less digits than its factorization.

66189650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42746 (or 42741 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 66189650 is about 8135.7021823565. The cubic root of 66189650 is about 404.5107132944.

The spelling of 66189650 in words is "sixty-six million, one hundred eighty-nine thousand, six hundred fifty".