664719549 has 8 divisors (see below), whose sum is σ = 954469152. Its totient is φ = 409058160.

The previous prime is 664719493. The next prime is 664719569. The reversal of 664719549 is 945917466.

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

It is not a de Polignac number, because 664719549 - 2⁷ = 664719421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664719569) 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, 8522007 + ... + 8522084.

It is an arithmetic number, because the mean of its divisors is an integer number (119308644).

Almost surely, 2^664719549 is an apocalyptic number.

It is an amenable number.

664719549 is a deficient number, since it is larger than the sum of its proper divisors (289749603).

664719549 is a wasteful number, since it uses less digits than its factorization.

664719549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17044107.

The product of its digits is 1632960, while the sum is 51.

The square root of 664719549 is about 25782.1556313664. The cubic root of 664719549 is about 872.7291534179.

The spelling of 664719549 in words is "six hundred sixty-four million, seven hundred nineteen thousand, five hundred forty-nine".