664791548 has 12 divisors (see below), whose sum is σ = 1191760752. Its totient is φ = 324288480.

The previous prime is 664791529. The next prime is 664791577. The reversal of 664791548 is 845197466.

It is a junction number, because it is equal to n+sod(n) for n = 664791496 and 664791505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026640 + ... + 2026967.

It is an arithmetic number, because the mean of its divisors is an integer number (99313396).

Almost surely, 2^664791548 is an apocalyptic number.

It is an amenable number.

664791548 is a deficient number, since it is larger than the sum of its proper divisors (526969204).

664791548 is a wasteful number, since it uses less digits than its factorization.

664791548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053652 (or 4053650 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The square root of 664791548 is about 25783.5518887526. The cubic root of 664791548 is about 872.7606621235.

The spelling of 664791548 in words is "six hundred sixty-four million, seven hundred ninety-one thousand, five hundred forty-eight".