666551704 has 96 divisors (see below), whose sum is σ = 1578603600. Its totient is φ = 261515520.

The previous prime is 666551687. The next prime is 666551713. The reversal of 666551704 is 407155666.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 707874 + ... + 708814.

Almost surely, 2^666551704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666551704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789301800).

666551704 is an abundant number, since it is smaller than the sum of its proper divisors (912051896).

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

666551704 is a wasteful number, since it uses less digits than its factorization.

666551704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1102 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 666551704 is about 25817.6626362651. The cubic root of 666551704 is about 873.5302472797.

The spelling of 666551704 in words is "six hundred sixty-six million, five hundred fifty-one thousand, seven hundred four".