66650209019 has 8 divisors (see below), whose sum is σ = 67031590080. Its totient is φ = 66268972800.

The previous prime is 66650209007. The next prime is 66650209049. The reversal of 66650209019 is 91090205666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66650209019 - 2²⁴ = 66633431803 is a prime.

It is a super-2 number, since 2×66650209019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66650209049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965579 + ... + 1032299.

It is an arithmetic number, because the mean of its divisors is an integer number (8378948760).

Almost surely, 2^66650209019 is an apocalyptic number.

66650209019 is a deficient number, since it is larger than the sum of its proper divisors (381381061).

66650209019 is a wasteful number, since it uses less digits than its factorization.

66650209019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72421.

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 66650209019 in words is "sixty-six billion, six hundred fifty million, two hundred nine thousand, nineteen".