664137019 has 8 divisors (see below), whose sum is σ = 817399520. Its totient is φ = 525470976.

The previous prime is 664137007. The next prime is 664137043. The reversal of 664137019 is 910731466.

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 664137019 - 2²³ = 655748411 is a prime.

It is a super-2 number, since 2×664137019² = 882155960012412722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664137049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3649014 + ... + 3649195.

It is an arithmetic number, because the mean of its divisors is an integer number (102174940).

Almost surely, 2^664137019 is an apocalyptic number.

664137019 is a deficient number, since it is larger than the sum of its proper divisors (153262501).

664137019 is a wasteful number, since it uses less digits than its factorization.

664137019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7298229.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 664137019 is about 25770.8560005290. The cubic root of 664137019 is about 872.4741388547.

It can be divided in two parts, 6641 and 37019, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 664137019 in words is "six hundred sixty-four million, one hundred thirty-seven thousand, nineteen".