666501424 has 80 divisors (see below), whose sum is σ = 1366894656. Its totient is φ = 314496000.

The previous prime is 666501401. The next prime is 666501443. The reversal of 666501424 is 424105666.

It is a self number, because there is not a number n which added to its sum of digits gives 666501424.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4245154 + ... + 4245310.

Almost surely, 2^666501424 is an apocalyptic number.

It is an amenable number.

666501424 is an abundant number, since it is smaller than the sum of its proper divisors (700393232).

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

666501424 is a wasteful number, since it uses less digits than its factorization.

666501424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 666501424 is about 25816.6888659255. The cubic root of 666501424 is about 873.5082823894.

The spelling of 666501424 in words is "six hundred sixty-six million, five hundred one thousand, four hundred twenty-four".