664424550 has 72 divisors (see below), whose sum is σ = 1842709440. Its totient is φ = 171460800.

The previous prime is 664424543. The next prime is 664424569. The reversal of 664424550 is 55424466.

664424550 is a `hidden beast` number, since 6 + 64 + 42 + 4 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9865 + ... + 37764.

Almost surely, 2^664424550 is an apocalyptic number.

664424550 is an abundant number, since it is smaller than the sum of its proper divisors (1178284890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664424550 is a wasteful number, since it uses less digits than its factorization.

664424550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47678 (or 47670 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 664424550 is about 25776.4340047261. The cubic root of 664424550 is about 872.6000301292.

The spelling of 664424550 in words is "six hundred sixty-four million, four hundred twenty-four thousand, five hundred fifty".