666235478 has 8 divisors (see below), whose sum is σ = 1005337872. Its totient is φ = 331122856.

The previous prime is 666235433. The next prime is 666235499. The reversal of 666235478 is 874532666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997025 + ... + 997692.

It is an arithmetic number, because the mean of its divisors is an integer number (125667234).

Almost surely, 2^666235478 is an apocalyptic number.

666235478 is a deficient number, since it is larger than the sum of its proper divisors (339102394).

666235478 is a wasteful number, since it uses less digits than its factorization.

666235478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994886.

The product of its digits is 1451520, while the sum is 47.

The square root of 666235478 is about 25811.5376915053. The cubic root of 666235478 is about 873.3920851190.

The spelling of 666235478 in words is "six hundred sixty-six million, two hundred thirty-five thousand, four hundred seventy-eight".