664830019 has 16 divisors (see below), whose sum is σ = 793797120. Its totient is φ = 544420800.

The previous prime is 664829981. The next prime is 664830029. The reversal of 664830019 is 910038466.

It is not a de Polignac number, because 664830019 - 2¹¹ = 664827971 is a prime.

It is a super-2 number, since 2×664830019² = 883997908327080722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664830019.

It is not an unprimeable number, because it can be changed into a prime (664830029) 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, 167247 + ... + 171175.

It is an arithmetic number, because the mean of its divisors is an integer number (49612320).

Almost surely, 2^664830019 is an apocalyptic number.

664830019 is a deficient number, since it is larger than the sum of its proper divisors (128967101).

664830019 is a wasteful number, since it uses less digits than its factorization.

664830019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 664830019 is about 25784.2979155920. The cubic root of 664830019 is about 872.7774971389. Note that the first 3 decimals are identical.

The spelling of 664830019 in words is "six hundred sixty-four million, eight hundred thirty thousand, nineteen".