646403366 has 8 divisors (see below), whose sum is σ = 1108120080. Its totient is φ = 277030008.

The previous prime is 646403327. The next prime is 646403377. The reversal of 646403366 is 663304646.

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

It is a super-3 number, since 3×646403366³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 23085821 + ... + 23085848.

It is an arithmetic number, because the mean of its divisors is an integer number (138515010).

Almost surely, 2^646403366 is an apocalyptic number.

646403366 is a deficient number, since it is larger than the sum of its proper divisors (461716714).

646403366 is a wasteful number, since it uses less digits than its factorization.

646403366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46171678.

The product of its (nonzero) digits is 186624, while the sum is 38.

The square root of 646403366 is about 25424.4639274853. The cubic root of 646403366 is about 864.6384339840.

The spelling of 646403366 in words is "six hundred forty-six million, four hundred three thousand, three hundred sixty-six".