666003859 has 8 divisors (see below), whose sum is σ = 678090240. Its totient is φ = 653944200.

The previous prime is 666003857. The next prime is 666003887. The reversal of 666003859 is 958300666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666003859 - 2¹ = 666003857 is a prime.

It is a super-2 number, since 2×666003859² = 887122280405783762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666003857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47554 + ... + 59944.

It is an arithmetic number, because the mean of its divisors is an integer number (84761280).

Almost surely, 2^666003859 is an apocalyptic number.

666003859 is a deficient number, since it is larger than the sum of its proper divisors (12086381).

666003859 is a wasteful number, since it uses less digits than its factorization.

666003859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13361.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 666003859 is about 25807.0505676259. The cubic root of 666003859 is about 873.2908608245.

The spelling of 666003859 in words is "six hundred sixty-six million, three thousand, eight hundred fifty-nine".