665706000 has 80 divisors (see below), whose sum is σ = 2146255488. Its totient is φ = 177520000.

The previous prime is 665705981. The next prime is 665706001. The reversal of 665706000 is 607566.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (665706001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49476 + ... + 61475.

Almost surely, 2^665706000 is an apocalyptic number.

665706000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665706000 is an abundant number, since it is smaller than the sum of its proper divisors (1480549488).

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

665706000 is a wasteful number, since it uses less digits than its factorization.

665706000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110977 (or 110961 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 665706000 is about 25801.2790380632. The cubic root of 665706000 is about 873.1606532056.

The spelling of 665706000 in words is "six hundred sixty-five million, seven hundred six thousand".