66904740019 has 16 divisors (see below), whose sum is σ = 72323308512. Its totient is φ = 61525271808.

The previous prime is 66904740017. The next prime is 66904740053. The reversal of 66904740019 is 91004740966.

It is not a de Polignac number, because 66904740019 - 2¹ = 66904740017 is a prime.

It is a super-3 number, since 3×66904740019³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (66904740011) 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, 9220797 + ... + 9228049.

It is an arithmetic number, because the mean of its divisors is an integer number (4520206782).

Almost surely, 2^66904740019 is an apocalyptic number.

66904740019 is a deficient number, since it is larger than the sum of its proper divisors (5418568493).

66904740019 is a wasteful number, since it uses less digits than its factorization.

66904740019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9846.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 66904740019 in words is "sixty-six billion, nine hundred four million, seven hundred forty thousand, nineteen".